html {
    font-size: 18px;
    text-align: center;
    font-family: Helvetica,
                 sans-serif;
    background-color: #000000;
}

body {
    color: #00ff00;
    width: max(320px, 40vw);
    margin: 0 auto;
    border: 4px solid #00ff00;
    border-radius: 16px;
    padding: 16px;
}

h1 {
    text-decoration: underline;
}

table {
    margin: 0 auto;
    border-collapse: collapse;
}

td, th {
    border: 2px dotted #00ff00;
    padding: 8px;
}

canvas {
    border: 1px solid #ffffff;
}