body {
    margin: 0;
    padding: 0;

    font-family: sans-serif;
}

main {
    height: 100vh;
    display: grid;
    grid-template-rows: 1fr auto;

    background-color: #555;
}

#back-button:link, #back-button:visited {
    position: absolute;
    text-decoration: none;
    background-color: #000;
    color: #aaa;
    padding: 0.5em;
}

#back-button:active, #back-button:hover {
    position: absolute;
    background-color: #555;
    color: #000;
}

#canvas-container {
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

header {
    background-color: #222;
    color: #eee;
}

#summary-container {
    color: #000;
    background-color: #fff;
}

h1 {
    margin: 0.25em 0.5em;
}

#main-canvas {
    background-color: #eee;
}

article, #summary-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

article {
    margin-top: -1em;
    margin-bottom: 1em;
}

article p {
    margin-bottom: 0;
}

p {
    width: 100ex;
}

footer {
    background-color: #222;
    color: #eee;
    font-family: monospace;
    text-align: center;
    padding: 0.5em;
}

@media (max-width: 100ex) {
    p {
        width: initial;
        margin: 1em;
    }
}