diff --git a/README.md b/README.md
index d76ece3..00a7cf6 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ This is a jQuery plugin.
 
 ## Requirements
 
-* Bootstrap 3
+* Bootstrap 4
 * jQuery
 * Ace editor (http://ace.c9.io)
 
diff --git a/dist/css/bootstrap-markdown-editor.css b/dist/css/bootstrap-markdown-editor.css
index db5fd78..4872a6d 100644
--- a/dist/css/bootstrap-markdown-editor.css
+++ b/dist/css/bootstrap-markdown-editor.css
@@ -1,6 +1,6 @@
 /*!
  * Bootstrap Markdown Editor v2.0.2 (https://github.com/inacho/bootstrap-markdown-editor)
- * Copyright 2016 Ignacio de Tomás <nacho@inacho.es>
+ * Copyright 2019 Ignacio de Tomás <nacho@inacho.es>
  * Licensed under MIT (https://github.com/inacho/bootstrap-markdown-editor/blob/master/LICENSE)
  */
 
diff --git a/dist/js/bootstrap-markdown-editor.js b/dist/js/bootstrap-markdown-editor.js
index cb6854f..45651f0 100644
--- a/dist/js/bootstrap-markdown-editor.js
+++ b/dist/js/bootstrap-markdown-editor.js
@@ -1,7 +1,7 @@
 /*!
  * Bootstrap Markdown Editor v2.0.2 (https://github.com/inacho/bootstrap-markdown-editor)
- * Copyright 2016 Ignacio de Tomás <nacho@inacho.es>
+ * Copyright 2019 Ignacio de Tomás <nacho@inacho.es>
  * Licensed under MIT (https://github.com/inacho/bootstrap-markdown-editor/blob/master/LICENSE)
  */
 
-!function(a){"use strict";function b(b,c,d,e,f){if(c.length){f.show();var g=new FormData,h=0;for(h=0;h<c.length;h++)g.append("file"+h,c[h]);a.ajax({url:b,type:"POST",contentType:!1,data:g,processData:!1,cache:!1,dataType:"json"}).done(function(a){var b="";a.length>1&&(b="\n");for(var c=0;c<a.length;c++)e.insertSnippet(d,"![]("+a[c]+")"+b)}).always(function(){f.hide()})}}function c(b){var c,d=a(window).height(),e=b.offset().top;d>e&&(c=d-e,b.css("height",c+"px"))}function d(a,b){a.commands.addCommand({name:"bold",bindKey:{win:"Ctrl-B",mac:"Command-B"},exec:function(a){var c=a.session.getTextRange(a.getSelectionRange());""===c?b.insertSnippet(a,"**${1:text}**"):b.insertSnippet(a,"**"+c+"**")},readOnly:!1}),a.commands.addCommand({name:"italic",bindKey:{win:"Ctrl-I",mac:"Command-I"},exec:function(a){var c=a.session.getTextRange(a.getSelectionRange());""===c?b.insertSnippet(a,"*${1:text}*"):b.insertSnippet(a,"*"+c+"*")},readOnly:!1}),a.commands.addCommand({name:"link",bindKey:{win:"Ctrl-K",mac:"Command-K"},exec:function(a){var c=a.session.getTextRange(a.getSelectionRange());""===c?b.insertSnippet(a,"[${1:text}](http://$2)"):b.insertSnippet(a,"["+c+"](http://$1)")},readOnly:!1})}function e(a,b){0===a.getCursorPosition().column?(a.navigateLineStart(),a.insert(b+" ")):(a.navigateLineStart(),a.insert(b+" "),a.navigateLineEnd())}function f(b,c){var d="";return d+='<div class="md-loading"><span class="md-icon-container"><span class="md-icon"></span></span></div>',d+='<div class="md-toolbar">',d+='<div class="btn-toolbar">',d+='<div class="btn-group">',d+='<button type="button" data-mdtooltip="tooltip" title="'+c.label.btnHeader1+'" class="md-btn btn btn-sm btn-default" data-btn="h1">H1</button>',d+='<button type="button" data-mdtooltip="tooltip" title="'+c.label.btnHeader2+'" class="md-btn btn btn-sm btn-default" data-btn="h2">H2</button>',d+='<button type="button" data-mdtooltip="tooltip" title="'+c.label.btnHeader3+'" class="md-btn btn btn-sm btn-default" data-btn="h3">H3</button>',d+="</div>",d+='<div class="btn-group">',d+='<button type="button" data-mdtooltip="tooltip" title="'+c.label.btnBold+'" class="md-btn btn btn-sm btn-default" data-btn="bold"><span class="glyphicon glyphicon-bold"></span></button>',d+='<button type="button" data-mdtooltip="tooltip" title="'+c.label.btnItalic+'" class="md-btn btn btn-sm btn-default" data-btn="italic"><span class="glyphicon glyphicon-italic"></span></button>',d+="</div>",d+='<div class="btn-group">',d+='<button type="button" data-mdtooltip="tooltip" title="'+c.label.btnList+'" class="md-btn btn btn-sm btn-default" data-btn="ul"><span class="glyphicon glyphicon glyphicon-list"></span></button>',d+='<button type="button" data-mdtooltip="tooltip" title="'+c.label.btnOrderedList+'" class="md-btn btn btn-sm btn-default" data-btn="ol"><span class="glyphicon glyphicon-th-list"></span></button>',d+="</div>",d+='<div class="btn-group">',d+='<button type="button" data-mdtooltip="tooltip" title="'+c.label.btnLink+'" class="md-btn btn btn-sm btn-default" data-btn="link"><span class="glyphicon glyphicon-link"></span></button>',d+='<button type="button" data-mdtooltip="tooltip" title="'+c.label.btnImage+'" class="md-btn btn btn-sm btn-default" data-btn="image"><span class="glyphicon glyphicon-picture"></span></button>',c.imageUpload===!0&&(d+='<div data-mdtooltip="tooltip" title="'+c.label.btnUpload+'" class="btn btn-sm btn-default md-btn-file"><span class="glyphicon glyphicon-upload"></span><input class="md-input-upload" type="file" multiple accept=".jpg,.jpeg,.png,.gif"></div>'),d+="</div>",c.fullscreen===!0&&(d+='<div class="btn-group pull-right">',d+='<button type="button" class="md-btn btn btn-sm btn-default" data-btn="fullscreen"><span class="glyphicon glyphicon-fullscreen"></span> '+c.label.btnFullscreen+"</button>",d+="</div>"),c.preview===!0&&(d+='<div class="btn-group pull-right">',d+='<button type="button" class="md-btn btn btn-sm btn-default btn-edit active" data-btn="edit"><span class="glyphicon glyphicon-pencil"></span> '+c.label.btnEdit+"</button>",d+='<button type="button" class="md-btn btn btn-sm btn-default btn-preview" data-btn="preview"><span class="glyphicon glyphicon-eye-open"></span> '+c.label.btnPreview+"</button>",d+="</div>"),d+="</div>",d+="</div>",d+='<div class="md-editor">'+a("<div>").text(b).html()+"</div>",d+='<div class="md-preview" style="display:none"></div>'}var g={init:function(g){var h,i=a.extend(!0,{},a.fn.markdownEditor.defaults,g),j=this,k=!1,l=!1;j.addClass("md-textarea-hidden"),h=a("<div/>"),j.after(h),h.addClass("md-container").html(f(j.val(),i)),"function"==typeof a().tooltip&&h.find('[data-mdtooltip="tooltip"]').tooltip({container:"body"});var m=h.find(".md-editor"),n=h.find(".md-preview"),o=h.find(".md-loading");h.css({width:i.width}),m.css({height:i.height,fontSize:i.fontSize}),n.css({height:i.height});var p,q=ace.edit(m[0]);return q.setTheme("ace/theme/"+i.theme),q.getSession().setMode("ace/mode/markdown"),q.getSession().setUseWrapMode(!0),q.getSession().setUseSoftTabs(i.softTabs),q.getSession().on("change",function(){j.val(q.getSession().getValue())}),q.setHighlightActiveLine(!1),q.setShowPrintMargin(!1),q.renderer.setShowGutter(!1),ace.config.loadModule("ace/ext/language_tools",function(){p=ace.require("ace/snippets").snippetManager,d(q,p)}),i.imageUpload&&(h.find(".md-input-upload").on("change",function(){var c=a(this).get(0).files;b(i.uploadPath,c,q,p,o)}),h.on("dragenter",function(a){a.stopPropagation(),a.preventDefault()}),h.on("dragover",function(a){a.stopPropagation(),a.preventDefault()}),h.on("drop",function(a){a.preventDefault();var c=a.originalEvent.dataTransfer.files;b(i.uploadPath,c,q,p,o)})),i.fullscreen===!0&&a(window).resize(function(){l===!0&&c(k===!1?m:n)}),h.find(".md-btn").click(function(){var b=a(this).data("btn"),d=q.session.getTextRange(q.getSelectionRange());"h1"===b?e(q,"#"):"h2"===b?e(q,"##"):"h3"===b?e(q,"###"):"ul"===b?e(q,"*"):"ol"===b?e(q,"1."):"bold"===b?q.execCommand("bold"):"italic"===b?q.execCommand("italic"):"link"===b?q.execCommand("link"):"image"===b?""===d?p.insertSnippet(q,"![${1:text}](http://$2)"):p.insertSnippet(q,"!["+d+"](http://$1)"):"edit"===b?(k=!1,n.hide(),m.show(),h.find(".btn-edit").addClass("active"),h.find(".btn-preview").removeClass("active"),l===!0&&c(m)):"preview"===b?(k=!0,n.html('<p style="text-align:center; font-size:16px">'+i.label.loading+"...</p>"),i.onPreview(q.getSession().getValue(),function(a){n.html(a)}),m.hide(),n.show(),h.find(".btn-preview").addClass("active"),h.find(".btn-edit").removeClass("active"),l===!0&&c(n)):"fullscreen"===b&&(l===!0?(l=!1,a("body, html").removeClass("md-body-fullscreen"),h.removeClass("md-fullscreen"),m.css("height",i.height),n.css("height",i.height)):(l=!0,a("body, html").addClass("md-body-fullscreen"),h.addClass("md-fullscreen"),c(k===!1?m:n)),q.resize()),q.focus()}),this},content:function(){var a=ace.edit(this.find(".md-editor")[0]);return a.getSession().getValue()},setContent:function(a){var b=ace.edit(this.find(".md-editor")[0]);b.setValue(a,1)}};a.fn.markdownEditor=function(b){return g[b]?g[b].apply(this,Array.prototype.slice.call(arguments,1)):"object"!=typeof b&&b?void a.error("Method "+b+" does not exist on jQuery.markdownEditor"):g.init.apply(this,arguments)},a.fn.markdownEditor.defaults={width:"100%",height:"400px",fontSize:"14px",theme:"tomorrow",softTabs:!0,fullscreen:!0,imageUpload:!1,uploadPath:"",preview:!1,onPreview:function(a,b){b(a)},label:{btnHeader1:"Header 1",btnHeader2:"Header 2",btnHeader3:"Header 3",btnBold:"Bold",btnItalic:"Italic",btnList:"Unordered list",btnOrderedList:"Ordered list",btnLink:"Link",btnImage:"Insert image",btnUpload:"Upload image",btnEdit:"Edit",btnPreview:"Preview",btnFullscreen:"Fullscreen",loading:"Loading"}}}(jQuery);
\ No newline at end of file
+!function(u){"use strict";function f(t,e,a,i,n){if(e.length){n.show();var o=new FormData,s=0;for(s=0;s<e.length;s++)o.append("file"+s,e[s]);u.ajax({url:t,type:"POST",contentType:!1,data:o,processData:!1,cache:!1,dataType:"json"}).done(function(t){var e="";1<t.length&&(e="\n");for(var n=0;n<t.length;n++)i.insertSnippet(a,"![]("+t[n]+")"+e)}).always(function(){n.hide()})}}function g(t){var e,n=u(window).height(),a=t.offset().top;a<n&&(e=n-a,t.css("height",e+"px"))}function v(t,e){0===t.getCursorPosition().column?(t.navigateLineStart(),t.insert(e+" ")):(t.navigateLineStart(),t.insert(e+" "),t.navigateLineEnd())}var e={init:function(t){var n,e,a,i,o=u.extend(!0,{},u.fn.markdownEditor.defaults,t),s=this,d=!1,l=!1;s.addClass("md-textarea-hidden"),n=u("<div/>"),s.after(n),n.addClass("md-container").html((e=s.val(),i="",i+='<div class="md-loading"><span class="md-icon-container"><span class="md-icon"></span></span></div>',i+='<div class="md-toolbar">',i+='<div class="btn-toolbar">',i+='<div class="btn-group md-toolbar-header mr-2">',i+='<button type="button" data-mdtooltip="tooltip" title="'+(a=o).label.btnHeader1+'" class="md-btn btn btn-sm btn-secondary" data-btn="h1">H1</button>',i+='<button type="button" data-mdtooltip="tooltip" title="'+a.label.btnHeader2+'" class="md-btn btn btn-sm btn-secondary" data-btn="h2">H2</button>',i+='<button type="button" data-mdtooltip="tooltip" title="'+a.label.btnHeader3+'" class="md-btn btn btn-sm btn-secondary" data-btn="h3">H3</button>',i+="</div>",i+='<div class="btn-group md-toolbar-text-style mr-2">',i+='<button type="button" data-mdtooltip="tooltip" title="'+a.label.btnBold+'" class="md-btn btn btn-sm btn-secondary" data-btn="bold"><span class="fas fa-bold"></span></button>',i+='<button type="button" data-mdtooltip="tooltip" title="'+a.label.btnItalic+'" class="md-btn btn btn-sm btn-secondary" data-btn="italic"><span class="fas fa-italic"></span></button>',i+="</div>",i+='<div class="btn-group md-toolbar-list mr-2">',i+='<button type="button" data-mdtooltip="tooltip" title="'+a.label.btnList+'" class="md-btn btn btn-sm btn-secondary" data-btn="ul"><span class="fas fa-list-ul"></span></button>',i+='<button type="button" data-mdtooltip="tooltip" title="'+a.label.btnOrderedList+'" class="md-btn btn btn-sm btn-secondary" data-btn="ol"><span class="fas fa-list-ol"></span></button>',i+="</div>",i+='<div class="btn-group md-toolbar-url mr-auto">',i+='<button type="button" data-mdtooltip="tooltip" title="'+a.label.btnLink+'" class="md-btn btn btn-sm btn-secondary" data-btn="link"><span class="fas fa-link"></span></button>',i+='<button type="button" data-mdtooltip="tooltip" title="'+a.label.btnImage+'" class="md-btn btn btn-sm btn-secondary" data-btn="image"><span class="fas fa-image"></span></button>',!0===a.imageUpload&&(i+='<div data-mdtooltip="tooltip" title="'+a.label.btnUpload+'" class="btn btn-sm btn-secondary md-btn-file"><span class="fas fa-file-upload"></span><input class="md-input-upload" type="file" multiple accept=".jpg,.jpeg,.png,.gif"></div>'),i+="</div>",!0===a.fullscreen&&(i+='<div class="btn-group md-toolbar-fullscreen mr-2">',i+='<button type="button" class="md-btn btn btn-sm btn-secondary" data-btn="fullscreen"><span class="fas fa-expand"></span> '+a.label.btnFullscreen+"</button>",i+="</div>"),!0===a.preview&&(i+='<div class="btn-group md-toolbar-preview">',i+='<button type="button" class="md-btn btn btn-sm btn-secondary btn-edit active" data-btn="edit"><span class="fas fa-edit"></span> '+a.label.btnEdit+"</button>",i+='<button type="button" class="md-btn btn btn-sm btn-secondary btn-preview" data-btn="preview"><span class="fas fa-eye"></span> '+a.label.btnPreview+"</button>",i+="</div>"),i+="</div>",i+="</div>",i+='<div class="md-editor">'+u("<div>").text(e).html()+"</div>",i+='<div class="md-preview" style="display:none"></div>')),"function"==typeof u().tooltip&&n.find('[data-mdtooltip="tooltip"]').tooltip({container:"body"});var r=n.find(".md-editor"),b=n.find(".md-preview"),c=n.find(".md-loading");n.css({width:o.width}),r.css({height:o.height,fontSize:o.fontSize}),b.css({height:o.height});var p,m=ace.edit(r[0]);return m.setTheme("ace/theme/"+o.theme),m.getSession().setMode("ace/mode/markdown"),m.getSession().setUseWrapMode(!0),m.getSession().setUseSoftTabs(o.softTabs),m.getSession().on("change",function(){s.val(m.getSession().getValue())}),m.setHighlightActiveLine(!1),m.setShowPrintMargin(!1),m.renderer.setShowGutter(!1),ace.config.loadModule("ace/ext/language_tools",function(){var t,n;p=ace.require("ace/snippets").snippetManager,n=p,(t=m).commands.addCommand({name:"bold",bindKey:{win:"Ctrl-B",mac:"Command-B"},exec:function(t){var e=t.session.getTextRange(t.getSelectionRange());""===e?n.insertSnippet(t,"**${1:text}**"):n.insertSnippet(t,"**"+e+"**")},readOnly:!1}),t.commands.addCommand({name:"italic",bindKey:{win:"Ctrl-I",mac:"Command-I"},exec:function(t){var e=t.session.getTextRange(t.getSelectionRange());""===e?n.insertSnippet(t,"*${1:text}*"):n.insertSnippet(t,"*"+e+"*")},readOnly:!1}),t.commands.addCommand({name:"link",bindKey:{win:"Ctrl-K",mac:"Command-K"},exec:function(t){var e=t.session.getTextRange(t.getSelectionRange());""===e?n.insertSnippet(t,"[${1:text}](http://$2)"):n.insertSnippet(t,"["+e+"](http://$1)")},readOnly:!1})}),o.imageUpload&&(n.find(".md-input-upload").on("change",function(){var t=u(this).get(0).files;f(o.uploadPath,t,m,p,c)}),n.on("dragenter",function(t){t.stopPropagation(),t.preventDefault()}),n.on("dragover",function(t){t.stopPropagation(),t.preventDefault()}),n.on("drop",function(t){t.preventDefault();var e=t.originalEvent.dataTransfer.files;f(o.uploadPath,e,m,p,c)})),!0===o.fullscreen&&u(window).resize(function(){!0===l&&g(!1===d?r:b)}),n.find(".md-btn").click(function(){var t=u(this).data("btn"),e=m.session.getTextRange(m.getSelectionRange());"h1"===t?v(m,"#"):"h2"===t?v(m,"##"):"h3"===t?v(m,"###"):"ul"===t?v(m,"*"):"ol"===t?v(m,"1."):"bold"===t?m.execCommand("bold"):"italic"===t?m.execCommand("italic"):"link"===t?m.execCommand("link"):"image"===t?""===e?p.insertSnippet(m,"![${1:text}](http://$2)"):p.insertSnippet(m,"!["+e+"](http://$1)"):"edit"===t?(d=!1,b.hide(),r.show(),n.find(".btn-edit").addClass("active"),n.find(".btn-preview").removeClass("active"),!0===l&&g(r)):"preview"===t?(d=!0,b.html('<p style="text-align:center; font-size:16px">'+o.label.loading+"...</p>"),o.onPreview(m.getSession().getValue(),function(t){b.html(t)}),r.hide(),b.show(),n.find(".btn-preview").addClass("active"),n.find(".btn-edit").removeClass("active"),!0===l&&g(b)):"fullscreen"===t&&(!0===l?(l=!1,u("body, html").removeClass("md-body-fullscreen"),n.removeClass("md-fullscreen"),r.css("height",o.height),b.css("height",o.height)):(l=!0,u("body, html").addClass("md-body-fullscreen"),n.addClass("md-fullscreen"),g(!1===d?r:b)),m.resize()),m.focus()}),this},content:function(){return ace.edit(this.find(".md-editor")[0]).getSession().getValue()},setContent:function(t){ace.edit(this.find(".md-editor")[0]).setValue(t,1)}};u.fn.markdownEditor=function(t){return e[t]?e[t].apply(this,Array.prototype.slice.call(arguments,1)):"object"!=typeof t&&t?void u.error("Method "+t+" does not exist on jQuery.markdownEditor"):e.init.apply(this,arguments)},u.fn.markdownEditor.defaults={width:"100%",height:"400px",fontSize:"14px",theme:"tomorrow",softTabs:!0,fullscreen:!0,imageUpload:!1,uploadPath:"",preview:!1,onPreview:function(t,e){e(t)},label:{btnHeader1:"Header 1",btnHeader2:"Header 2",btnHeader3:"Header 3",btnBold:"Bold",btnItalic:"Italic",btnList:"Unordered list",btnOrderedList:"Ordered list",btnLink:"Link",btnImage:"Insert image",btnUpload:"Upload image",btnEdit:"Edit",btnPreview:"Preview",btnFullscreen:"Fullscreen",loading:"Loading"}}}(jQuery);
\ No newline at end of file
diff --git a/src/bootstrap-markdown-editor.js b/src/bootstrap-markdown-editor.js
index 16ae146..d48d5f2 100644
--- a/src/bootstrap-markdown-editor.js
+++ b/src/bootstrap-markdown-editor.js
@@ -118,40 +118,40 @@
         html += '<div class="md-toolbar">';
             html += '<div class="btn-toolbar">';
 
-                html += '<div class="btn-group">';
-                    html += '<button type="button" data-mdtooltip="tooltip" title="' + options.label.btnHeader1 + '" class="md-btn btn btn-sm btn-default" data-btn="h1">H1</button>';
-                    html += '<button type="button" data-mdtooltip="tooltip" title="' + options.label.btnHeader2 + '" class="md-btn btn btn-sm btn-default" data-btn="h2">H2</button>';
-                    html += '<button type="button" data-mdtooltip="tooltip" title="' + options.label.btnHeader3 + '" class="md-btn btn btn-sm btn-default" data-btn="h3">H3</button>';
+                html += '<div class="btn-group md-toolbar-header mr-2">';
+                    html += '<button type="button" data-mdtooltip="tooltip" title="' + options.label.btnHeader1 + '" class="md-btn btn btn-sm btn-secondary" data-btn="h1">H1</button>';
+                    html += '<button type="button" data-mdtooltip="tooltip" title="' + options.label.btnHeader2 + '" class="md-btn btn btn-sm btn-secondary" data-btn="h2">H2</button>';
+                    html += '<button type="button" data-mdtooltip="tooltip" title="' + options.label.btnHeader3 + '" class="md-btn btn btn-sm btn-secondary" data-btn="h3">H3</button>';
                 html += '</div>'; // .btn-group
 
-                html += '<div class="btn-group">';
-                    html += '<button type="button" data-mdtooltip="tooltip" title="' + options.label.btnBold + '" class="md-btn btn btn-sm btn-default" data-btn="bold"><span class="glyphicon glyphicon-bold"></span></button>';
-                    html += '<button type="button" data-mdtooltip="tooltip" title="' + options.label.btnItalic + '" class="md-btn btn btn-sm btn-default" data-btn="italic"><span class="glyphicon glyphicon-italic"></span></button>';
+                html += '<div class="btn-group md-toolbar-text-style mr-2">';
+                    html += '<button type="button" data-mdtooltip="tooltip" title="' + options.label.btnBold + '" class="md-btn btn btn-sm btn-secondary" data-btn="bold"><span class="fas fa-bold"></span></button>';
+                    html += '<button type="button" data-mdtooltip="tooltip" title="' + options.label.btnItalic + '" class="md-btn btn btn-sm btn-secondary" data-btn="italic"><span class="fas fa-italic"></span></button>';
                 html += '</div>'; // .btn-group
 
-                html += '<div class="btn-group">';
-                    html += '<button type="button" data-mdtooltip="tooltip" title="' + options.label.btnList + '" class="md-btn btn btn-sm btn-default" data-btn="ul"><span class="glyphicon glyphicon glyphicon-list"></span></button>';
-                    html += '<button type="button" data-mdtooltip="tooltip" title="' + options.label.btnOrderedList + '" class="md-btn btn btn-sm btn-default" data-btn="ol"><span class="glyphicon glyphicon-th-list"></span></button>';
+                html += '<div class="btn-group md-toolbar-list mr-2">';
+                    html += '<button type="button" data-mdtooltip="tooltip" title="' + options.label.btnList + '" class="md-btn btn btn-sm btn-secondary" data-btn="ul"><span class="fas fa-list-ul"></span></button>';
+                    html += '<button type="button" data-mdtooltip="tooltip" title="' + options.label.btnOrderedList + '" class="md-btn btn btn-sm btn-secondary" data-btn="ol"><span class="fas fa-list-ol"></span></button>';
                 html += '</div>'; // .btn-group
 
-                html += '<div class="btn-group">';
-                    html += '<button type="button" data-mdtooltip="tooltip" title="' + options.label.btnLink + '" class="md-btn btn btn-sm btn-default" data-btn="link"><span class="glyphicon glyphicon-link"></span></button>';
-                    html += '<button type="button" data-mdtooltip="tooltip" title="' + options.label.btnImage + '" class="md-btn btn btn-sm btn-default" data-btn="image"><span class="glyphicon glyphicon-picture"></span></button>';
+                html += '<div class="btn-group md-toolbar-url mr-auto">';
+                    html += '<button type="button" data-mdtooltip="tooltip" title="' + options.label.btnLink + '" class="md-btn btn btn-sm btn-secondary" data-btn="link"><span class="fas fa-link"></span></button>';
+                    html += '<button type="button" data-mdtooltip="tooltip" title="' + options.label.btnImage + '" class="md-btn btn btn-sm btn-secondary" data-btn="image"><span class="fas fa-image"></span></button>';
                     if (options.imageUpload === true) {
-                        html += '<div data-mdtooltip="tooltip" title="' + options.label.btnUpload + '" class="btn btn-sm btn-default md-btn-file"><span class="glyphicon glyphicon-upload"></span><input class="md-input-upload" type="file" multiple accept=".jpg,.jpeg,.png,.gif"></div>';
+                        html += '<div data-mdtooltip="tooltip" title="' + options.label.btnUpload + '" class="btn btn-sm btn-secondary md-btn-file"><span class="fas fa-file-upload"></span><input class="md-input-upload" type="file" multiple accept=".jpg,.jpeg,.png,.gif"></div>';
                     }
                 html += '</div>'; // .btn-group
 
                 if (options.fullscreen === true) {
-                    html += '<div class="btn-group pull-right">';
-                        html += '<button type="button" class="md-btn btn btn-sm btn-default" data-btn="fullscreen"><span class="glyphicon glyphicon-fullscreen"></span> ' + options.label.btnFullscreen + '</button>';
+                    html += '<div class="btn-group md-toolbar-fullscreen mr-2">';
+                        html += '<button type="button" class="md-btn btn btn-sm btn-secondary" data-btn="fullscreen"><span class="fas fa-expand"></span> ' + options.label.btnFullscreen + '</button>';
                     html += '</div>'; // .btn-group
                 }
 
                 if (options.preview === true) {
-                    html += '<div class="btn-group pull-right">';
-                        html += '<button type="button" class="md-btn btn btn-sm btn-default btn-edit active" data-btn="edit"><span class="glyphicon glyphicon-pencil"></span> ' + options.label.btnEdit + '</button>';
-                        html += '<button type="button" class="md-btn btn btn-sm btn-default btn-preview" data-btn="preview"><span class="glyphicon glyphicon-eye-open"></span> ' + options.label.btnPreview + '</button>';
+                    html += '<div class="btn-group md-toolbar-preview">';
+                        html += '<button type="button" class="md-btn btn btn-sm btn-secondary btn-edit active" data-btn="edit"><span class="fas fa-edit"></span> ' + options.label.btnEdit + '</button>';
+                        html += '<button type="button" class="md-btn btn btn-sm btn-secondary btn-preview" data-btn="preview"><span class="fas fa-eye"></span> ' + options.label.btnPreview + '</button>';
                     html += '</div>'; // .btn-group
                 }