diff --git a/02-express-tutorial/app.js b/02-express-tutorial/app.js
index ce296a6ee3..36dc1a5939 100644
--- a/02-express-tutorial/app.js
+++ b/02-express-tutorial/app.js
@@ -1 +1,16 @@
-console.log('Express Tutorial')
+const express = require("express");
+const app = express();
+
+app.get("/", (req, res) => {
+	const method = req.method;
+
+	res.send("Home");
+});
+
+app.get("/abput", (req, res) => {
+	res.send("About");
+});
+
+app.listen(5000, () => {
+	console.log("server is listening to port");
+});
diff --git a/02-express-tutorial/authorize.js b/02-express-tutorial/authorize.js
new file mode 100644
index 0000000000..be213bc928
--- /dev/null
+++ b/02-express-tutorial/authorize.js
@@ -0,0 +1,13 @@
+const authorize = (req, res, next) => {
+	const { user } = req.query;
+	if (user === "vini") {
+		// adding a property of user to req object
+		req.user = { name: "vini", id: "4" };
+		next();
+	} else {
+		res.status(401).send("Unauthorised");
+	}
+
+	next();
+};
+module.exports = authorize;
diff --git a/02-express-tutorial/final/01-http-basics.js b/02-express-tutorial/final/01-http-basics.js
index b76f108caa..03d3307ca8 100644
--- a/02-express-tutorial/final/01-http-basics.js
+++ b/02-express-tutorial/final/01-http-basics.js
@@ -1,26 +1,27 @@
-const http = require('http')
+const http = require("http");
 
 const server = http.createServer((req, res) => {
-  // console.log(req.method)
-  const url = req.url
-  // home page
-  if (url === '/') {
-    res.writeHead(200, { 'content-type': 'text/html' })
-    res.write('<h1>home page</h1>')
-    res.end()
-  }
-  // about page
-  else if (url === '/about') {
-    res.writeHead(200, { 'content-type': 'text/html' })
-    res.write('<h1>about page</h1>')
-    res.end()
-  }
-  // 404
-  else {
-    res.writeHead(404, { 'content-type': 'text/html' })
-    res.write('<h1>page not found</h1>')
-    res.end()
-  }
-})
+	// console.log(req.method)
+	// console.log(req.url)
+	const url = req.url;
+	// home page
+	if (url === "/") {
+		res.writeHead(200, { "content-type": "text/html" });
+		res.write("<h1>home page</h1>");
+		res.end();
+	}
+	// about page
+	else if (url === "/about") {
+		res.writeHead(200, { "content-type": "text/html" });
+		res.write("<h1>about page</h1>");
+		res.end();
+	}
+	// 404
+	else {
+		res.writeHead(404, { "content-type": "text/html" });
+		res.write("<h1>page not found</h1>");
+		res.end();
+	}
+});
 
-server.listen(5000)
+server.listen(5000);
diff --git a/02-express-tutorial/final/04-express-app.js b/02-express-tutorial/final/04-express-app.js
index fb4843d3da..e178aee764 100644
--- a/02-express-tutorial/final/04-express-app.js
+++ b/02-express-tutorial/final/04-express-app.js
@@ -1,19 +1,25 @@
-const express = require('express')
-const path = require('path')
+const express = require("express");
 
-const app = express()
+// to get absolute path of the file
+const path = require("path");
+
+const app = express();
 
 // setup static and middleware
-app.use(express.static('./public'))
+/*
+app.use() is used to set up middleware. express.static is a built in middleware.
+static assets are files that server doen't have to change , example  image files,CSS files
+*/
+app.use(express.static("./public"));
 
-app.get('/', (req, res) => {
-  res.sendFile(path.resolve(__dirname, './navbar-app/index.html'))
-})
+app.get("/", (req, res) => {
+	res.sendFile(path.resolve(__dirname, "./navbar-app/index.html"));
+});
 
-app.all('*', (req, res) => {
-  res.status(404).send('resource not found')
-})
+app.all("*", (req, res) => {
+	res.status(404).send("resource not found");
+});
 
 app.listen(5000, () => {
-  console.log('server is listening on port 5000....')
-})
+	console.log("server is listening on port 5000....");
+});
diff --git a/02-express-tutorial/final/06-basic-json.js b/02-express-tutorial/final/06-basic-json.js
index 9d1dc0e4ec..25a9a7856b 100644
--- a/02-express-tutorial/final/06-basic-json.js
+++ b/02-express-tutorial/final/06-basic-json.js
@@ -1,10 +1,11 @@
-const express = require('express')
-const app = express()
-const { products } = require('./data')
-app.get('/', (req, res) => {
-  res.json(products)
-})
+const express = require("express");
+// invoke express
+const app = express();
+const { products } = require("./data");
+app.get("/", (req, res) => {
+	res.json(products);
+});
 
 app.listen(5000, () => {
-  console.log('Server is listening on port 5000....')
-})
+	console.log("Server is listening on port 5000....");
+});
diff --git a/02-express-tutorial/final/09-middleware-use.js b/02-express-tutorial/final/09-middleware-use.js
index 9e575efee6..0417eeb022 100644
--- a/02-express-tutorial/final/09-middleware-use.js
+++ b/02-express-tutorial/final/09-middleware-use.js
@@ -1,24 +1,24 @@
-const express = require('express')
-const app = express()
-const logger = require('./logger')
-const authorize = require('./authorize')
+const express = require("express");
+const app = express();
+const logger = require("./logger");
+const authorize = require("./authorize");
 //  req => middleware => res
-app.use([logger, authorize])
+app.use([logger, authorize]);
 // api/home/about/products
-app.get('/', (req, res) => {
-  res.send('Home')
-})
-app.get('/about', (req, res) => {
-  res.send('About')
-})
-app.get('/api/products', (req, res) => {
-  res.send('Products')
-})
-app.get('/api/items', (req, res) => {
-  console.log(req.user)
-  res.send('Items')
-})
+app.get("/", (req, res) => {
+	res.send("Home");
+});
+app.get("/about", (req, res) => {
+	res.send("About");
+});
+app.get("/api/products", (req, res) => {
+	res.send("Products");
+});
+app.get("/api/items", (req, res) => {
+	console.log(req.user);
+	res.send("Items");
+});
 
 app.listen(5000, () => {
-  console.log('Server is listening on port 5000....')
-})
+	console.log("Server is listening on port 5000....");
+});
diff --git a/02-express-tutorial/final/10-middleware-options.js b/02-express-tutorial/final/10-middleware-options.js
index a3bdb0bd6b..643cadf1e5 100644
--- a/02-express-tutorial/final/10-middleware-options.js
+++ b/02-express-tutorial/final/10-middleware-options.js
@@ -1,28 +1,31 @@
-const express = require('express')
-const app = express()
-const morgan = require('morgan')
-const logger = require('./logger')
-const authorize = require('./authorize')
+const express = require("express");
+const app = express();
+const morgan = require("morgan");
+const logger = require("./logger");
+const authorize = require("./authorize");
 //  req => middleware => res
 
+// 1. use vs route
+// 2. options - our own/express/ third party middle wares
+
 // app.use([logger, authorize])
 // app.use(express.static('./public'))
-app.use(morgan('tiny'))
+app.use(morgan("tiny"));
 
-app.get('/', (req, res) => {
-  res.send('Home')
-})
-app.get('/about', (req, res) => {
-  res.send('About')
-})
-app.get('/api/products', (req, res) => {
-  res.send('Products')
-})
-app.get('/api/items', (req, res) => {
-  console.log(req.user)
-  res.send('Items')
-})
+app.get("/", (req, res) => {
+	res.send("Home");
+});
+app.get("/about", (req, res) => {
+	res.send("About");
+});
+app.get("/api/products", (req, res) => {
+	res.send("Products");
+});
+app.get("/api/items", (req, res) => {
+	console.log(req.user);
+	res.send("Items");
+});
 
 app.listen(5000, () => {
-  console.log('Server is listening on port 5000....')
-})
+	console.log("Server is listening on port 5000....");
+});
diff --git a/02-express-tutorial/final/11-methods.js b/02-express-tutorial/final/11-methods.js
index 9e7ee1e90b..1ca6ba68d2 100644
--- a/02-express-tutorial/final/11-methods.js
+++ b/02-express-tutorial/final/11-methods.js
@@ -1,80 +1,81 @@
-const express = require('express')
-const app = express()
-let { people } = require('./data')
+const express = require("express");
+const app = express();
+let { people } = require("./data");
 
 // static assets
-app.use(express.static('./methods-public'))
+// express.static is a built in middleware
+app.use(express.static("./methods-public"));
 // parse form data
-app.use(express.urlencoded({ extended: false }))
+app.use(express.urlencoded({ extended: false }));
 // parse json
-app.use(express.json())
+app.use(express.json());
 
-app.get('/api/people', (req, res) => {
-  res.status(200).json({ success: true, data: people })
-})
+app.get("/api/people", (req, res) => {
+	res.status(200).json({ success: true, data: people });
+});
 
-app.post('/api/people', (req, res) => {
-  const { name } = req.body
-  if (!name) {
-    return res
-      .status(400)
-      .json({ success: false, msg: 'please provide name value' })
-  }
-  res.status(201).json({ success: true, person: name })
-})
+app.post("/api/people", (req, res) => {
+	const { name } = req.body;
+	if (!name) {
+		return res
+			.status(400)
+			.json({ success: false, msg: "please provide name value" });
+	}
+	res.status(201).json({ success: true, person: name });
+});
 
-app.post('/api/postman/people', (req, res) => {
-  const { name } = req.body
-  if (!name) {
-    return res
-      .status(400)
-      .json({ success: false, msg: 'please provide name value' })
-  }
-  res.status(201).json({ success: true, data: [...people, name] })
-})
+app.post("/api/postman/people", (req, res) => {
+	const { name } = req.body;
+	if (!name) {
+		return res
+			.status(400)
+			.json({ success: false, msg: "please provide name value" });
+	}
+	res.status(201).json({ success: true, data: [...people, name] });
+});
 
-app.post('/login', (req, res) => {
-  const { name } = req.body
-  if (name) {
-    return res.status(200).send(`Welcome ${name}`)
-  }
+app.post("/login", (req, res) => {
+	const { name } = req.body;
+	if (name) {
+		return res.status(200).send(`Welcome ${name}`);
+	}
 
-  res.status(401).send('Please Provide Credentials')
-})
+	res.status(401).send("Please Provide Credentials");
+});
 
-app.put('/api/people/:id', (req, res) => {
-  const { id } = req.params
-  const { name } = req.body
+app.put("/api/people/:id", (req, res) => {
+	const { id } = req.params;
+	const { name } = req.body;
 
-  const person = people.find((person) => person.id === Number(id))
+	const person = people.find((person) => person.id === Number(id));
 
-  if (!person) {
-    return res
-      .status(404)
-      .json({ success: false, msg: `no person with id ${id}` })
-  }
-  const newPeople = people.map((person) => {
-    if (person.id === Number(id)) {
-      person.name = name
-    }
-    return person
-  })
-  res.status(200).json({ success: true, data: newPeople })
-})
+	if (!person) {
+		return res
+			.status(404)
+			.json({ success: false, msg: `no person with id ${id}` });
+	}
+	const newPeople = people.map((person) => {
+		if (person.id === Number(id)) {
+			person.name = name;
+		}
+		return person;
+	});
+	res.status(200).json({ success: true, data: newPeople });
+});
 
-app.delete('/api/people/:id', (req, res) => {
-  const person = people.find((person) => person.id === Number(req.params.id))
-  if (!person) {
-    return res
-      .status(404)
-      .json({ success: false, msg: `no person with id ${req.params.id}` })
-  }
-  const newPeople = people.filter(
-    (person) => person.id !== Number(req.params.id)
-  )
-  return res.status(200).json({ success: true, data: newPeople })
-})
+app.delete("/api/people/:id", (req, res) => {
+	const person = people.find((person) => person.id === Number(req.params.id));
+	if (!person) {
+		return res
+			.status(404)
+			.json({ success: false, msg: `no person with id ${req.params.id}` });
+	}
+	const newPeople = people.filter(
+		(person) => person.id !== Number(req.params.id),
+	);
+	return res.status(200).json({ success: true, data: newPeople });
+});
 
 app.listen(5000, () => {
-  console.log('Server is listening on port 5000....')
-})
+	console.log("Server is listening on port 5000....");
+});
diff --git a/02-express-tutorial/logger.js b/02-express-tutorial/logger.js
new file mode 100644
index 0000000000..5d4e3b217a
--- /dev/null
+++ b/02-express-tutorial/logger.js
@@ -0,0 +1,9 @@
+const logger = (req, res, next) => {
+	const method = req.method;
+	const url = req.url;
+	const time = new Date().getFullYear();
+	console.log(method, url, time);
+	next();
+};
+
+module.exports = logger;
diff --git a/02-express-tutorial/package-lock.json b/02-express-tutorial/package-lock.json
index 417394ff8b..1d8bf22741 100644
--- a/02-express-tutorial/package-lock.json
+++ b/02-express-tutorial/package-lock.json
@@ -5,10 +5,12 @@
   "requires": true,
   "packages": {
     "": {
+      "name": "2-express-tutorial",
       "version": "1.0.0",
       "license": "ISC",
       "dependencies": {
-        "express": "^4.17.1"
+        "express": "^4.17.1",
+        "morgan": "^1.10.0"
       },
       "devDependencies": {
         "nodemon": "^2.0.7"
@@ -160,6 +162,17 @@
       "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
       "dev": true
     },
+    "node_modules/basic-auth": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/basic-auth/-/basic-auth-2.0.1.tgz",
+      "integrity": "sha512-NF+epuEdnUYVlGuhaxbbq+dvJttwLnGY+YixlXlME5KpQ5W3CnXA5cVTneY3SPbPDRkcjMbifrwmFYcClgOZeg==",
+      "dependencies": {
+        "safe-buffer": "5.1.2"
+      },
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/binary-extensions": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.2.0.tgz",
@@ -1127,6 +1140,42 @@
       "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==",
       "dev": true
     },
+    "node_modules/morgan": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/morgan/-/morgan-1.10.0.tgz",
+      "integrity": "sha512-AbegBVI4sh6El+1gNwvD5YIck7nSA36weD7xvIxG4in80j/UoK8AEGaWnnz8v1GxonMCltmlNs5ZKbGvl9b1XQ==",
+      "dependencies": {
+        "basic-auth": "~2.0.1",
+        "debug": "2.6.9",
+        "depd": "~2.0.0",
+        "on-finished": "~2.3.0",
+        "on-headers": "~1.0.2"
+      },
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
+    "node_modules/morgan/node_modules/debug": {
+      "version": "2.6.9",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "dependencies": {
+        "ms": "2.0.0"
+      }
+    },
+    "node_modules/morgan/node_modules/depd": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/depd/-/depd-2.0.0.tgz",
+      "integrity": "sha512-g7nH6P6dyDioJogAAGprGpCtVImJhpPk/roCzdb3fIh61/s/nPsfR6onyMwkCAR/OlC3yBC0lESvUoQEAssIrw==",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/morgan/node_modules/ms": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+      "integrity": "sha512-Tpp60P6IUJDTuOq/5Z8cdskzJujfwqfOTkrwIwj7IRISpnkJnT6SyJ4PCPnGMoFjC9ddhal5KVIYtAt97ix05A=="
+    },
     "node_modules/ms": {
       "version": "2.1.3",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
@@ -1214,6 +1263,14 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/on-headers": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/on-headers/-/on-headers-1.0.2.tgz",
+      "integrity": "sha512-pZAE+FJLoyITytdqK0U5s+FIpjN0JP3OzFi/u8Rx+EV5/W+JTWGXG8xFzevE7AjBfDqHv/8vL8qQsIhHnqRkrA==",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/once": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
@@ -1919,6 +1976,14 @@
       "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
       "dev": true
     },
+    "basic-auth": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/basic-auth/-/basic-auth-2.0.1.tgz",
+      "integrity": "sha512-NF+epuEdnUYVlGuhaxbbq+dvJttwLnGY+YixlXlME5KpQ5W3CnXA5cVTneY3SPbPDRkcjMbifrwmFYcClgOZeg==",
+      "requires": {
+        "safe-buffer": "5.1.2"
+      }
+    },
     "binary-extensions": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.2.0.tgz",
@@ -2676,6 +2741,38 @@
       "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==",
       "dev": true
     },
+    "morgan": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/morgan/-/morgan-1.10.0.tgz",
+      "integrity": "sha512-AbegBVI4sh6El+1gNwvD5YIck7nSA36weD7xvIxG4in80j/UoK8AEGaWnnz8v1GxonMCltmlNs5ZKbGvl9b1XQ==",
+      "requires": {
+        "basic-auth": "~2.0.1",
+        "debug": "2.6.9",
+        "depd": "~2.0.0",
+        "on-finished": "~2.3.0",
+        "on-headers": "~1.0.2"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "depd": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/depd/-/depd-2.0.0.tgz",
+          "integrity": "sha512-g7nH6P6dyDioJogAAGprGpCtVImJhpPk/roCzdb3fIh61/s/nPsfR6onyMwkCAR/OlC3yBC0lESvUoQEAssIrw=="
+        },
+        "ms": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+          "integrity": "sha512-Tpp60P6IUJDTuOq/5Z8cdskzJujfwqfOTkrwIwj7IRISpnkJnT6SyJ4PCPnGMoFjC9ddhal5KVIYtAt97ix05A=="
+        }
+      }
+    },
     "ms": {
       "version": "2.1.3",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
@@ -2734,6 +2831,11 @@
         "ee-first": "1.1.1"
       }
     },
+    "on-headers": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/on-headers/-/on-headers-1.0.2.tgz",
+      "integrity": "sha512-pZAE+FJLoyITytdqK0U5s+FIpjN0JP3OzFi/u8Rx+EV5/W+JTWGXG8xFzevE7AjBfDqHv/8vL8qQsIhHnqRkrA=="
+    },
     "once": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
diff --git a/02-express-tutorial/package.json b/02-express-tutorial/package.json
index be7d86b24c..7b5cf9015c 100644
--- a/02-express-tutorial/package.json
+++ b/02-express-tutorial/package.json
@@ -10,7 +10,8 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "express": "^4.17.1"
+    "express": "^4.17.1",
+    "morgan": "^1.10.0"
   },
   "devDependencies": {
     "nodemon": "^2.0.7"
diff --git a/02-express-tutorial/public/browser-app.js b/02-express-tutorial/public/browser-app.js
new file mode 100644
index 0000000000..b37d1be152
--- /dev/null
+++ b/02-express-tutorial/public/browser-app.js
@@ -0,0 +1,6 @@
+const navToggle = document.querySelector('.nav-toggle')
+const links = document.querySelector('.links')
+
+navToggle.addEventListener('click', function () {
+  links.classList.toggle('show-links')
+})
diff --git a/02-express-tutorial/public/logo.svg b/02-express-tutorial/public/logo.svg
new file mode 100644
index 0000000000..cccc49be15
--- /dev/null
+++ b/02-express-tutorial/public/logo.svg
@@ -0,0 +1,17 @@
+<svg width="230" height="47" viewBox="0 0 230 47" fill="none" xmlns="http://www.w3.org/2000/svg">
+<g filter="url(#filter0_d)">
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+</g>
+<defs>
+<filter id="filter0_d" x="0.758789" y="9.5" width="229.171" height="36.7402" filterUnits="userSpaceOnUse" color-interpolation-filters="sRGB">
+<feFlood flood-opacity="0" result="BackgroundImageFix"/>
+<feColorMatrix in="SourceAlpha" type="matrix" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 127 0"/>
+<feOffset dy="4"/>
+<feGaussianBlur stdDeviation="2"/>
+<feColorMatrix type="matrix" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.25 0"/>
+<feBlend mode="normal" in2="BackgroundImageFix" result="effect1_dropShadow"/>
+<feBlend mode="normal" in="SourceGraphic" in2="effect1_dropShadow" result="shape"/>
+</filter>
+</defs>
+</svg>
diff --git a/02-express-tutorial/public/styles.css b/02-express-tutorial/public/styles.css
new file mode 100644
index 0000000000..3de663e79b
--- /dev/null
+++ b/02-express-tutorial/public/styles.css
@@ -0,0 +1,247 @@
+/*
+=============== 
+Fonts
+===============
+*/
+@import url("https://fonts.googleapis.com/css?family=Open+Sans|Roboto:400,700&display=swap");
+
+/*
+=============== 
+Variables
+===============
+*/
+
+:root {
+  /* dark shades of primary color*/
+  --clr-primary-1: hsl(205, 86%, 17%);
+  --clr-primary-2: hsl(205, 77%, 27%);
+  --clr-primary-3: hsl(205, 72%, 37%);
+  --clr-primary-4: hsl(205, 63%, 48%);
+  /* primary/main color */
+  --clr-primary-5: hsl(205, 78%, 60%);
+  /* lighter shades of primary color */
+  --clr-primary-6: hsl(205, 89%, 70%);
+  --clr-primary-7: hsl(205, 90%, 76%);
+  --clr-primary-8: hsl(205, 86%, 81%);
+  --clr-primary-9: hsl(205, 90%, 88%);
+  --clr-primary-10: hsl(205, 100%, 96%);
+  /* darkest grey - used for headings */
+  --clr-grey-1: hsl(209, 61%, 16%);
+  --clr-grey-2: hsl(211, 39%, 23%);
+  --clr-grey-3: hsl(209, 34%, 30%);
+  --clr-grey-4: hsl(209, 28%, 39%);
+  /* grey used for paragraphs */
+  --clr-grey-5: hsl(210, 22%, 49%);
+  --clr-grey-6: hsl(209, 23%, 60%);
+  --clr-grey-7: hsl(211, 27%, 70%);
+  --clr-grey-8: hsl(210, 31%, 80%);
+  --clr-grey-9: hsl(212, 33%, 89%);
+  --clr-grey-10: hsl(210, 36%, 96%);
+  --clr-white: #fff;
+  --clr-red-dark: hsl(360, 67%, 44%);
+  --clr-red-light: hsl(360, 71%, 66%);
+  --clr-green-dark: hsl(125, 67%, 44%);
+  --clr-green-light: hsl(125, 71%, 66%);
+  --clr-black: #222;
+  --ff-primary: "Roboto", sans-serif;
+  --ff-secondary: "Open Sans", sans-serif;
+  --transition: all 0.3s linear;
+  --spacing: 0.1rem;
+  --radius: 0.25rem;
+  --light-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
+  --dark-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
+  --max-width: 1170px;
+  --fixed-width: 620px;
+}
+/*
+=============== 
+Global Styles
+===============
+*/
+
+*,
+::after,
+::before {
+  margin: 0;
+  padding: 0;
+  box-sizing: border-box;
+}
+body {
+  font-family: var(--ff-secondary);
+  background: var(--clr-grey-10);
+  color: var(--clr-grey-1);
+  line-height: 1.5;
+  font-size: 0.875rem;
+}
+ul {
+  list-style-type: none;
+}
+a {
+  text-decoration: none;
+}
+h1,
+h2,
+h3,
+h4 {
+  letter-spacing: var(--spacing);
+  text-transform: capitalize;
+  line-height: 1.25;
+  margin-bottom: 0.75rem;
+  font-family: var(--ff-primary);
+}
+h1 {
+  font-size: 3rem;
+}
+h2 {
+  font-size: 2rem;
+}
+h3 {
+  font-size: 1.25rem;
+}
+h4 {
+  font-size: 0.875rem;
+}
+p {
+  margin-bottom: 1.25rem;
+  color: var(--clr-grey-5);
+}
+@media screen and (min-width: 800px) {
+  h1 {
+    font-size: 4rem;
+  }
+  h2 {
+    font-size: 2.5rem;
+  }
+  h3 {
+    font-size: 1.75rem;
+  }
+  h4 {
+    font-size: 1rem;
+  }
+  body {
+    font-size: 1rem;
+  }
+  h1,
+  h2,
+  h3,
+  h4 {
+    line-height: 1;
+  }
+}
+/*  global classes */
+
+/* section */
+.section {
+  padding: 5rem 0;
+}
+
+.section-center {
+  width: 90vw;
+  margin: 0 auto;
+  max-width: 1170px;
+}
+@media screen and (min-width: 992px) {
+  .section-center {
+    width: 95vw;
+  }
+}
+main {
+  min-height: 100vh;
+  display: grid;
+  place-items: center;
+}
+
+/*
+=============== 
+Navbar
+===============
+*/
+nav {
+  background: var(--clr-white);
+  box-shadow: var(--light-shadow);
+}
+.nav-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 1rem;
+}
+.nav-toggle {
+  font-size: 1.5rem;
+  color: var(--clr-primary-5);
+  background: transparent;
+  border-color: transparent;
+  transition: var(--transition);
+  cursor: pointer;
+}
+.nav-toggle:hover {
+  color: var(--clr-primary-1);
+  transform: rotate(90deg);
+}
+.logo {
+  height: 40px;
+}
+.links a {
+  color: var(--clr-grey-3);
+  font-size: 1rem;
+  text-transform: capitalize;
+  letter-spacing: var(--spacing);
+  display: block;
+  padding: 0.5rem 1rem;
+  transition: var(--transition);
+}
+.links a:hover {
+  background: var(--clr-primary-8);
+  color: var(--clr-primary-5);
+  padding-left: 1.5rem;
+}
+.social-icons {
+  display: none;
+}
+.links {
+  height: 0;
+  overflow: hidden;
+  transition: var(--transition);
+}
+.show-links {
+  height: 10rem;
+}
+@media screen and (min-width: 800px) {
+  .nav-center {
+    max-width: 1170px;
+    margin: 0 auto;
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    padding: 1rem;
+  }
+  .nav-header {
+    padding: 0;
+  }
+  .nav-toggle {
+    display: none;
+  }
+  .links {
+    height: auto;
+    display: flex;
+  }
+  .links a {
+    padding: 0;
+    margin: 0 0.5rem;
+  }
+  .links a:hover {
+    padding: 0;
+    background: transparent;
+  }
+  .social-icons {
+    display: flex;
+  }
+  .social-icons a {
+    margin: 0 0.5rem;
+    color: var(--clr-primary-5);
+    transition: var(--transition);
+  }
+  .social-icons a:hover {
+    color: var(--clr-primary-7);
+  }
+}