style.css

body {
    padding: 0;
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Arial", sans-serif;
}

h1 {
    font-size: 10em;
    margin-top: 0;
}

p {
    color: rgb(107, 114, 128);
    font-size: 1em;
    margin-bottom: 10px;
    margin-top: 5px;
}

.card {
    max-width: 620px;
    margin: 0 auto;
    padding: 16px;
    border: 1px solid lightgray;
    border-radius: 16px;
}

.card p:last-child {
    margin-bottom: 0;
}

canvas {
    display: block;
    margin: 0 auto;
    background-color: black;
}