style.css

@font-face {
    font-family: marcellus-regular;
    src: url('Marcellus-Regular.ttf');
}

body {
    height: 100%;
    font-family: marcellus-regular, sans-serif;
    width: 1200px;
    margin-left: auto;
    margin-right: auto;
    color: #444;
}

html {
    height: 100%;
}

h2 {
    font-size: 34pt;
    font-weight: bold;
    text-align: center;
    margin-top: 8pt;
    margin-bottom: 8pt;
}

canvas {
    border-width: 1px;
    border-style: solid;
    border-color: #51B4D4;
}

div.plane-wrapper {
    display: inline-block;
    width: 560px;
    height: 420px;
    margin: 2pt;
}

div.color-picker {
    width: 300pt;
    height: 40pt;
    margin-left: auto;
    margin-right: auto;
}

span.colorbox-option {
    box-sizing: border-box;
    border-width: 1px;
    border-style: outset;
    border-color: lightgray;
}

span.colorbox-selected {
    border-style: inset;
    border-width: 2px;
}