html, body {
    margin: 0px; 
    background: white;
}

#grid {
    width: 80vmin;
    height: 80vmin;
    font-size: 2.5vmin;
    margin: 1rem auto;
}

#code-show {
    background: black;
    color: #0f0;
    margin: 0;
    width: 90vw;
    white-space: pre-line;
    padding: 1rem 5vw;
}