index.css

@media (min-width: 740px) {
    body {
        width: 712px;
        margin: 0 auto;
    }
}

body {
    background: #f9f9f9;
    padding: 12px;
}

#noSupport {
    border: 4px solid red;
    padding: 8px;
    display: none;
}
#noSupport #noWorkerSupport, #noSupport #noSVGSupport {
    display: none;
}

#title {
    font-size: 2.5em;
    margin-bottom: 16px;
}

#controls {
    position: relative;
    margin-bottom: 16px;
}

#controlsTitle {
    padding: 6px;
    padding-bottom: 1px;
    border: 1px solid #c3c3c3;
    border-bottom: none;
    display: inline-block;
    background: white;
}

#confInput {
    padding: 1.5em 0em 1.5em 1.5em;
    border: 1px solid #c3c3c3;
    background: white;
    display: inline-block;
}

#confInput label {
    width: 140px;
    display: inline-block;
    margin-bottom: 12px;
    position: relative;
}

#confInput input[type="text"] {
    width: 5em;
    position: absolute;
    left: 2em;
    background: #fafafa;
}

form.conditionsInput {
    float: left;
}

form#conditionsSubmit {
    clear: both;
    float: left;
}

#runControls {
    background: white;
    border: 6px solid black;
    border-bottom: none;
    display: inline-block;
    padding: 6px;
}

#runControls input[type="button"] {
    width: 7em;
    margin: 0px 12px 0px 0px;
}

#controlsHelp {
    padding: 12px;
    min-height: 220px;
    border: 1px solid #c3c3c3;
    position: absolute;
    left: 8px;
    right: 8px;
    /* top is computed by javascript since we don't know heights before
       rendering */
    background-color: rgba(255,255,255,.95);
    visibility: hidden;
    z-index: 5;
}

#controlsHelp p {
    margin: 0 4px 0 0;
}

#controlsHelp svg {
    float: right;
}

#configHelpButtonSVG {
    position: absolute;
    cursor: pointer;
    bottom: 10px;
    right: 8px;
}

#pendula {
    border: 6px solid black;
    position: relative;
    padding-top: 100%;
}

#test {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

#getSVG {
    margin: 16px 0px;
    width: 100%;
}

#getSVG input {
    border: 2px solid black;
    margin-bottom: -2px;
}

#getSVG textarea {
    box-sizing: border-box;
    width: 100%;
}

#getSVGHeader {
    position: relative;
}

#getSVGHelpButtonSVG {
    position: absolute;
    cursor: pointer;
    bottom: 0px;
    right: 8px;
}

#getSVGHelpText {
    position: absolute;
    left: 8px;
    right: 8px;
    border: 1px solid #c3c3c3;
    /* top is computed by javascript since we don't know heights before
       rendering. */
    visibility: hidden;
    background: white;
}

#getSVGHelpText p {
    margin: 8px;
}