lkarch.org/tools/hexgl/libs/Editor_files/main.css

body {
    overflow: hidden;
    font-family: "Ubuntu sans", Arial, sans-serif;
    font-size: 14px;
    color: #ddd;
    line-height: 1em;
    background: #1e1e1e;
}

#panel-center {
    margin: 0;
    position: absolute;
    z-index: 20;
    top: 0;
    bottom: 0;
    left: 200px;
    right: 400px;
}

#panel-left {
    margin: 0;
    position: absolute;
    z-index: 10;
    top: 0;
    bottom: 0;
    left: 0;
    width: 200px;

    background: #191919;
}

#panel-right {
    margin: 0;
    position: absolute;
    z-index: 30;
    top: 0;
    bottom: 0;
    right: 0;
    width: 400px;

    background: #191919;
}

#editor { 
    margin: 0;
    position: absolute;
    top: 0;
    bottom: 50%;
    left: 0;
    right: 0;
    z-index: 100;
}

#diagram { 
    margin: 0;
    position: absolute;
    bottom: 0;
    top: 50%;
    left: 0;
    right: 0;
    z-index: 200;
}

#editor-separator, #preview-separator {
    margin: 0;
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 3px;
    z-index: 300;
    background: #191919;
    border-top: 1px solid #292929;
    border-bottom: 1px solid #292929;
}
#preview-separator {
    z-index: 400;
    left: 3px;
}

#left-separator {
    margin: 0;
    position: absolute;
    top: 0;
    bottom: 0;
    right: 0;
    width: 3px;
    z-index: 300;
    background: #191919;
}

#right-separator {
    margin: 0;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    width: 3px;
    z-index: 300;
    background: #191919;
}

#preview {
    margin: 0;
    position: absolute;
    top: 0;
    bottom: 50%;
    left: 3px;
    width: 396px;

    background: #1e1e1e;    
    border-left: 1px solid #292929;
    z-index: 210;
}

#console { 
    margin: 0;
    position: absolute;
    bottom: 0;
    top: 50%;
    left: 0;
    left: 3px;
    width: 396px;
    z-index: 220;
    background: #1e1e1e;    
    border-left: 1px solid #292929;
}

#console-text {
    background: transparent;
    border: none;
    width: 100%;
    height: 100%;
    color: #666;
    text-shadow: 0px 1px 1px #000000;
    filter: dropshadow(color=#000000, offx=0, offy=1);
    padding: 6px;
    outline: none;
    overflow: hidden;
    scroll: none;
}

#preview canvas {
    background: #161616;
}

#modules { 
    margin: 0;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    width: 196px;

    font-size: 13px;

    background: #1e1e1e;
    border-right: 1px solid #292929;
}

#modules ul {
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    
    list-style: none;
    margin: 10px 0;
    padding: 0;
}

#modules li {
    list-style: none;
    line-height: 2.0em;
    padding: 0 20px;
    background: #1e1e1e;
    cursor: pointer;

    text-shadow: 0px 1px 1px #000000;
    filter: dropshadow(color=#000000, offx=0, offy=1);
}

#modules li:hover {
    background: #434343; /* Old browsers */
    background: -moz-linear-gradient(top, #888 0%, #4e4e4e 4%, #434343 96%, #1e1e1e 100%); /* FF3.6+ */
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#888), color-stop(4%,#4e4e4e), color-stop(96%,#434343), color-stop(100%,#1e1e1e)); /* Chrome,Safari4+ */
    background: -webkit-linear-gradient(top, #888 0%, #4e4e4e 4%, #434343 96%, #1e1e1e 100%); /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(top, #888 0%, #4e4e4e 4%, #434343 96%, #1e1e1e 100%); /* Opera 11.10+ */
    background: -ms-linear-gradient(top, #888 0%, #4e4e4e 4%, #434343 96%, #1e1e1e 100%); /* IE10+ */
    background: linear-gradient(to bottom, #888 0%, #4e4e4e 4%, #434343 96%, #1e1e1e 100%); /* W3C */

}

#modules li.active {
    background: #292929;
}

#render
{
    position: absolute;
    z-index: 9999999;
}