style.css

body {
    margin: 0;
    background-color: white;
    font-size: small !important;
}

canvas {
    width: 100%;
    height: 100%;
    display: block;
    background-color: white;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    background: rgba(255, 255, 255, 1) url('https://art.pixilart.com/b05178369bdc7fc.gif') 50% 50% no-repeat;
    background-size: 20% 20%;
    align-content: center;
}

body.loading .modal {
    overflow: hidden;
    display: block;
}

.status-panel {
    margin: 0;
    background: rgba(255, 255, 255, 0.4);
    z-index: 10;
    position: fixed;
    top: 2em;
    left: 2em;
    padding: 1em;
    border-radius: 0.5em;
    min-width: 250px;
}

.settings-panel {
    margin: 0;
    background: rgba(255, 255, 255, 0.4);
    z-index: 10;
    position: fixed;
    top: 2em;
    right: 2em;
    padding: 1em;
    border-radius: 0.5em;
    min-width: 425px;
}

.lights-panel {
    margin: 0;
    background: rgba(255, 255, 255, 0.4);
    z-index: 10;
    position: fixed;
    bottom: 2em;
    left: 2em;
    padding: 1em;
    border-radius: 0.5em;
    min-width: 250px;
}

.control-panel {
    margin: 0;
    background: rgba(255, 255, 255, 0.4);
    z-index: 10;
    position: fixed;
    bottom: 2em;
    right: 2em;
    padding: 1em;
    border-radius: 0.5em;
    min-width: 250px;
}

.element {
    background: rgba(50, 50, 50, 0.4);
    border-radius: 0.3em;
}

.color-select {
    width: 100%;
    border: none;
    box-shadow: none;
    background: transparent;
}

.row {
    padding: 0 1em 0 1em;
}

.row label {
    margin-bottom: 0;
    min-width: 20px;
    font-size: 0.8em;
}

.row input[type="range"] {
    width: calc(100% - 20px - 0.5em);
    margin-left: 0.5em;
    display: inline-block;
    float: right;
}