.shaderDemo {
    background-color: #33383c;
    background-image: url("img/play.svg"); /* this icon is by MGalloway (WMF) */
    background-repeat: no-repeat;
    background-position: center; 
    background-size: 100px, 100px;
}
.shaderEditor {
    max-width: 750px;
}
.shaderError {
    background-color: #40423a;
    color:#f8f8f2;
    padding: 6px;
}
.editorHeader {
    background-color: #40423a;
    color:#f8f8f2;
    height: 32px;
}
.editorHeader span {
    padding-left: 10px;
    padding-right: 10px;
    margin-right:6px;
    background: #32332d;
    line-height:32px;
    display: inline-block;
    cursor: pointer;
}
.editorHeader span:hover {
    background: #272823;
}
.editorHeader .active {
    background: #272823;
}