index.css

/* Main Stylesheet */

main canvas {
    margin: 2em 3em;
    border: 1px solid gray;
}

.params {
    margin: 1.5em 2em;
}

.params input {
    margin-left: 1.5em;
    margin-bottom: 1em;

    font-size: inherit;
}

.params button {
    cursor: pointer;

    font-size: larger;
}

.output {
    display: block;

    border: none;
    border-radius: 0.5em;

    background-color: lightgray;
    overflow-y: auto;

    height: 16em;
    margin: 20px 10vw;

    padding: 1em;
}

footer {
    margin: 1em;

    text-align: right;
    font-size: smaller;

    color: gray;
}

footer a {
    color: inherit;
}