Source/devtools/front_end/spectrum.css

/* https://github.com/bgrins/spectrum */
.spectrum-container {
    position: absolute;
    top: 0;
    left: 0;
    display: inline-block;
    background: rgba(230, 230, 230, 1) !important;
    border: 1px solid #646464;
    padding: 10px;
    width: 220px;
    z-index: 10;
    -webkit-user-select: none;
}

.spectrum-top {
    position: relative;
    width: 100%;
    display: inline-block;
}

.spectrum-color {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 40px;
}

.spectrum-display-value {
    -webkit-user-select: text;
    position: relative;
    left: 2px;
    top: -6px;
}

.spectrum-hue {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 170px;
    -webkit-box-reflect: right -28px;
}

.spectrum-fill {
    /* Same as spectrum-color width to force aspect ratio. */
    margin-top: 150px;
}

.spectrum-range-container {
    position: relative;
    padding-bottom: 5px;
}

.spectrum-range-container * {
    font-size: 11px;
    vertical-align: middle;
}

.spectrum-range-container label {
    display: inline-block;
    padding-right: 4px;
}

.spectrum-range-container input {
    position: absolute;
    left: 15px;
    right: 40px;
    margin: 3px 0 0 0;
}

.spectrum-dragger,
.spectrum-slider {
    -webkit-user-select: none;
}

.spectrum-sat {
    background-image: -webkit-linear-gradient(left, white, rgba(204, 154, 129, 0));
}

.spectrum-val {
    background-image: -webkit-linear-gradient(bottom, black, rgba(204, 154, 129, 0));
}

.spectrum-hue {
    background: -webkit-linear-gradient(bottom, #ff0000 0%, #ffff00 17%, #00ff00 33%, #00ffff 50%, #0000ff 67%, #ff00ff 83%, #ff0000 100%);
}

.spectrum-dragger {
    border-radius: 5px;
    height: 5px;
    width: 5px;
    border: 1px solid white;
    cursor: pointer;
    position: absolute;
    top: 0;
    left: 0;
    background: black;
}

.spectrum-slider {
    position: absolute;
    top: 0;
    cursor: pointer;
    border: 1px solid black;
    height: 4px;
    left: -1px;
    right: -1px;
}

.spectrum-container .swatch {
    width: 20px;
    height:20px;
    margin: 0;
}