body {
    font-family: sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: #f0f0f0;
    margin: 0;
}

header {
    width: 100%;
    background-color: #333;
    color: white;
    padding: 1rem;
    text-align: center;
    box-sizing: border-box;
}

header a {
    color: #eee;
    text-decoration: none;
    position: absolute;
    top: 1rem;
    left: 1rem;
}

main {
    display: flex;
    flex-direction: row;
    margin-top: 1rem;
}

#controls {
    padding: 1rem;
    background-color: #ddd;
    border-radius: 5px;
    margin-right: 1rem;
}

canvas {
    border: 1px solid black;
    background-color: white;
}