illo.css

html {
    height: 100%;
}

body {
    height: 100%;
    margin: 0;
}

main {
    height: 100%;
    display: grid;
    grid-template-columns: 0.33fr 0.66fr;
    grid-template-areas: 'controls results';
}

section.controls {
    grid-area: controls;
    background-color: #f9f9f9;
    padding: 16px;
    min-width: 300px;
    height: 100%;
}

section.controls section {
    padding: 12px 0 12px 0;
}

section.results {
    grid-area: results;
    /*margin: auto;*/
    height: 100%;
}

section.illustration {
    margin: auto;
    padding: 36px;
}

section.code {
    height: 400px;
    width: 100%;
}

.controls_illo {
    border-bottom: 1px solid lightgrey;
}

div.parameter {
    margin: 12px 0 12px 0;
}

div.subparameter {
    margin: 12px 0 12px 24px;
}

input:disabled {
    color: #7c7c7c;
}

.controls_shape input {
    display: block;
    margin: 6px 0 10px 0;
}

canvas {
    border: 1px dotted lightgray;
}

#container {
    height: 300px;
    width: 100%;
    position: relative;
    top: 0;
}