diagram-js-code-editor/assets/diagram-js-code-editor.css

 .djs-editor {
   position: absolute;
   top: 90px;
   right: 20px;
   background-color: rgba(255, 255, 255, 0.9);
   color: rgb(0, 0, 0);
   border: solid 1px #CCC;
   border-radius: 2px;
   box-sizing: border-box;
   user-select: none;
   -moz-user-select: none;
   -ms-user-select: none;
   -webkit-user-select: none;
 }

 .djs-editor:not(.enabled) {
   color: #CCC;
   pointer-events: none;
 }

 .djs-editor:not(.open) {
   overflow: hidden;
 }

 .toolbar {
   display: none;
   width: 50%;
   list-style-type: none;
   padding: 0;
 }

 .djs-editor.open .toolbar {
   display: block;
   text-align: left;
   line-height: 35px;
 }

 .toolbar {
   width: 100%;
   float: left;
   margin: 0;
   padding: 0;
   background-color: #f2f2f2;
   border-bottom: 1px solid #ccc;
   border-top: 1px solid #ccc;
   position: relative;
   z-index: 1;
   text-decoration: none;
   font-weight: bold;
   color: #069;
 }

 /* Pure CSS DropDown Multilabil DropDown Menu */

 nav {
   display: block;
   width: 100%;
 }

 nav ul {
   padding: 0;
   margin: 0;
   list-style: none;
 }

 nav ul li {
   position: relative;
 }

 nav ul a {
   text-decoration: none;
   color: #000;
 }

 nav>ul>li {
   float: left;
   margin-right: 1px;
 }

 nav>ul>li>a {
   display: inline-block;
   padding: 4px 10px 0;
   height: 25px;
 }

 nav>ul>li.submenu>a {
   padding-right: 5px;
 }

 nav>ul>li.submenu>.description {
   padding-right: 5px;
 }

 nav>ul>li:hover {
   background: #000;
 }

 nav li.submenu {
   padding-right: 22px;
 }

 nav li.submenu:before {
   content: "☞";
   display: block;
   position: absolute;
   /* top:4px; */
   right: 0;
   color: #000;
   width: 16px;
 }

 nav ul ul {
   position: absolute;
   left: 0;
   /* top:29px; */
   width: 180px;
   filter: alpha(opacity="0");
   opacity: 0;
   background: #666;
   font-size: 12px;
   border: 1px solid #000;
   border-bottom: 0;
   border-top: 0;
 }

 .description {
   display: none
 }

 /* nav > ul > ul {
   height: 200px;
 }

 nav > ul > ul {
   overflow: hidden;
   overflow-y: scroll;
 } */

 nav ul ul li {
   display: none;
 }

 nav ul li.submenu:hover>ul>li {
   display: block;
 }

 nav ul li.submenu:hover {
   color: #fff;
 }

 nav ul li.submenu:hover>ul {
   filter: alpha(opacity="100");
   opacity: 1;
 }

 nav ul li.submenu:hover>ul ul {
   filter: alpha(opacity="0");
   opacity: 0;
 }

 nav ul li.submenu:hover>ul li.submenu:hover>ul {
   filter: alpha(opacity="100");
   opacity: 1;
 }

 nav ul li.submenu:hover>ul li.submenu:hover>ul>li {
   display: block;
 }

 nav ul ul li {
   border-bottom: 1px solid #000;
   background: #565656;
 }

 nav ul ul li:first-child {
   border-top: 1px solid #000;
 }

 nav ul ul li a {
   padding: 4px 10px;
   display: block;
 }

 nav ul ul li:hover {
   background: #000;
 }

 nav ul ul li:hover>a {
   padding-left: 15px;
   color: #fff;
 }

 nav ul ul ul {
   left: 180px;
   top: 0;
   margin-top: -1px;
 }

 /*  */

 #run_btn {
   font-family: "Material Icons", sans-serif;
 }

 #run_btn:before {
   content: "build";
 }

 #run_btn.passing {
   color: green;
 }

 #run_btn.failing {
   color: red;
 }

 #run_btn.unknown {
   color: rgba(207, 168, 10, 0.842);
 }

 .djs-editor .ide {
   position: relative;
   z-index: 0;
   display: none;
   width: 100%;
   min-width: 420px;
   height: 280px;
 }

 .djs-editor.open .ide {
   display: block;
 }

 .djs-editor:not(.open) .toggle {
   width: 46px;
   height: 46px;
   line-height: 46px;
   content: "dvr" !important;
   text-align: center;
 }

 .djs-editor.open .toggle:before {
   font-family: "Material Icons", sans-serif;
   content: "close" !important;
   font-size: 24px;
 }

 .djs-editor:not(.open) .toggle:before {
   font-family: "Material Icons", sans-serif;
   content: "dvr" !important;
   font-size: 24px;
 }

 .djs-editor .toggle:before {
   content: attr(title);
 }

 .djs-editor.open .toggle {
   position: absolute;
   right: 0;
   padding: 6px;
   z-index: 1;
 }