diff --git a/README.md b/README.md
index b85746d..bdc4ddf 100644
--- a/README.md
+++ b/README.md
@@ -441,3 +441,62 @@ Methods:
 * [translate(x: string | number, y?: string | number)](./docs/transform.md#translate-x-string-number-y-string-number-)
 * [skew(x: string | number, y?: string | number)](./docs/transform.md#skew-x-string-number-y-string-number-)
 * [transform(value: string)](./docs/transform.md#transform-value-string-)
+
+## [CSS]()
+
+Method for injecting arbitrary Stitches CSS into the current chain.
+Use this when you need a style that isn’t (yet) covered by the first-class chain methods,
+or when you want to author nested selectors and media queries inline.
+
+```typescript
+
+import { Frame } from "tile-css";
+
+const Hello = Frame()
+  .size(300)
+  .fg("white")
+  .mono(21, { color: "#000" })
+  .css({
+    border: "1px solid #000",
+    boxShadow: "0 10px 24px rgba(0,0,0,.18)",
+    textAlign: "center",
+  })
+  .css({
+    "@media (max-width: 480px)": {
+      width: 240,
+      height: 240,
+      fontSize: 14,
+    },
+  })
+  .element();
+
+function App() {
+  return <Hello>Hello world :)</Hello>;
+}
+
+export { App }
+```
+
+## [Additional]()
+
+if you chain a method that isn’t provided by a built-in module, it’s treated as a **CSS property** (camelCased) or a 
+**Stitches util** key and merged into the style tree. This lets you use one-off properties without writing a new module.
+
+```typescript
+
+import { View } from "tile-css";
+
+const Avatar = View("img")
+  .size(200)
+  .border("1px solid #000")
+  .round(12)
+  .objectFit('fill') // This doesn't exist in the first-class chain methods
+  .objectPosition('20% 20%') // This doesn't exist in the first-class chain methods
+  .element();
+
+function App() {
+  return <Avatar src="https://picsum.photos/100/100" alt="avatar" />
+}
+
+export { App }
+```
diff --git a/lib/chain.ts b/lib/chain.ts
index 6cd0613..14f4926 100644
--- a/lib/chain.ts
+++ b/lib/chain.ts
@@ -68,6 +68,8 @@ export function createChain(
   const variants: VariantCSS = { ...startingValues?.variants };
   const children: Record<string, CSS | Chain> = { ...startingValues?.children };
 
+  let self: Chain;
+
   const chain: Chain = {
     extend: (newElementTag?: Tag) => {
       return createChain(stitches, newElementTag || elementTag, {
@@ -80,7 +82,7 @@ export function createChain(
     // @ts-ignore
     select: (selector: string, subchain: CSS | Chain) => {
       children[selector] = subchain;
-      return chain;
+      return self;
     },
     // In your element method:
     element: (rawCSS?: CSS) => {
@@ -112,23 +114,49 @@ export function createChain(
           },
         ];
       }
-
-      return chain;
+      return self;
     },
+
     css: (rawCSS: CSS) => {
       update(rawCSS);
-      return chain;
+      return self;
     },
   };
 
   modules.forEach((m) => m.register(addMethod));
 
-  return chain;
+  const proxy = new Proxy(chain as Chain, {
+    get(target, propKey, receiver) {
+      // Default implemented methods
+      if (propKey in target) {
+        return Reflect.get(target, propKey, receiver);
+      }
+
+      if (typeof propKey !== "string") {
+        return undefined;
+      }
+
+      return (...args: any[]) => {
+        if (!args.length) {
+          return receiver;
+        }
+
+        // Fallback to style property update with given key-value pairs.
+        update({ [propKey]: args[0] });
+
+        return receiver;
+      };
+    },
+  });
+
+  self = proxy as Chain;
+
+  return proxy as Chain;
 
   function addMethod(name: string, fn: ChainMethod) {
     chain[name] = (...args: unknown[]) => {
       update(fn.apply(chain, [tree, ...args]));
-      return chain;
+      return self;
     };
   }
 
@@ -157,7 +185,7 @@ export function createChain(
     for (const selector in children) {
       output[selector] =
         typeof children[selector].compile === "function"
-          ? children[selector].compile()
+          ? (children[selector] as Chain).compile()
           : children[selector];
     }
 
diff --git a/playground/tile.js b/playground/tile.js
index 0d5cd56..33db3dc 100644
--- a/playground/tile.js
+++ b/playground/tile.js
@@ -30,9 +30,9 @@ var Tile = (() => {
   ));
   var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
 
-  // node_modules/.deno/react@18.3.1/node_modules/react/cjs/react.development.js
+  // node_modules/react/cjs/react.development.js
   var require_react_development = __commonJS({
-    "node_modules/.deno/react@18.3.1/node_modules/react/cjs/react.development.js"(exports, module) {
+    "node_modules/react/cjs/react.development.js"(exports, module) {
       "use strict";
       if (true) {
         (function() {
@@ -1904,9 +1904,9 @@ var Tile = (() => {
     }
   });
 
-  // node_modules/.deno/react@18.3.1/node_modules/react/index.js
+  // node_modules/react/index.js
   var require_react = __commonJS({
-    "node_modules/.deno/react@18.3.1/node_modules/react/index.js"(exports, module) {
+    "node_modules/react/index.js"(exports, module) {
       "use strict";
       if (false) {
         module.exports = null;
@@ -1931,7 +1931,7 @@ var Tile = (() => {
     style: () => style
   });
 
-  // node_modules/.deno/@stitches+react@1.2.8/node_modules/@stitches/react/dist/index.mjs
+  // node_modules/@stitches/react/dist/index.mjs
   var import_react = __toESM(require_react(), 1);
   var e = "colors";
   var t = "sizes";
@@ -3802,6 +3802,7 @@ var Tile = (() => {
     let tree = { ...startingValues?.tree };
     const variants = { ...startingValues?.variants };
     const children = { ...startingValues?.children };
+    let self;
     const chain = {
       extend: (newElementTag) => {
         return createChain(stitches, newElementTag || elementTag, {
@@ -3814,7 +3815,7 @@ var Tile = (() => {
       // @ts-ignore
       select: (selector, subchain) => {
         children[selector] = subchain;
-        return chain;
+        return self;
       },
       // In your element method:
       element: (rawCSS) => {
@@ -3839,19 +3840,37 @@ var Tile = (() => {
             }
           ];
         }
-        return chain;
+        return self;
       },
       css: (rawCSS) => {
         update(rawCSS);
-        return chain;
+        return self;
       }
     };
     modules.forEach((m2) => m2.register(addMethod));
-    return chain;
+    const proxy = new Proxy(chain, {
+      get(target, propKey, receiver) {
+        if (propKey in target) {
+          return Reflect.get(target, propKey, receiver);
+        }
+        if (typeof propKey !== "string") {
+          return void 0;
+        }
+        return (...args) => {
+          if (!args.length) {
+            return receiver;
+          }
+          update({ [propKey]: args[0] });
+          return receiver;
+        };
+      }
+    });
+    self = proxy;
+    return proxy;
     function addMethod(name, fn) {
       chain[name] = (...args) => {
         update(fn.apply(chain, [tree, ...args]));
-        return chain;
+        return self;
       };
     }
     function update(updates) {