body, html {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: black;
    height: 100%;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #00ff00;
    font-family: 'Courier New', Courier, monospace;
}

canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}