style.css

canvas {
    image-rendering: crisp-edges;
    image-rendering: pixelated;
}

main {
    max-width: 768px;
    width: 100%;
    height: auto;
    padding: 0;
    margin: 0 auto;
    margin-top: 50px;
}

canvas.game {
    display: block;
    width: 100%;
    height: auto;
    background-color: #222;
}

.game-overlay {
    position: absolute;
    font-family: sans-serif;
    text-align: center;
}

 h2 {
    color: white;
    font-size: 32px;
    text-shadow: 4px 4px black;
}

.game-overlay p {
    font-size: 24px;
    color: #eee;
    text-shadow: 2px 2px black;
}

.game-overlay em {
    color: yellow;
}

.game-overlay button {
    color: #eee;
    background-color: #444;
    text-shadow: 1px 1px black;
    border: none;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    box-shadow: 2px 2px black;
}

.game-overlay button:hover {
    color: #eee;
    background-color: #666;
}

body {
    padding: 0;
    background-color: #222;
}