* { margin: 0; padding: 0; box-sizing: border-box; }
body { background: #000; overflow: hidden; }
canvas { display: block; }
#back {
    position: fixed;
    top: 1rem;
    left: 1rem;
    color: #fff;
    text-decoration: none;
    font-family: monospace;
    font-size: 0.85rem;
    opacity: 0.4;
    transition: opacity 0.2s;
    z-index: 10;
}

#back:hover { opacity: 1; }

#reset {
    position: fixed;
    top: 1rem;
    right: 1rem;
    background: none;
    border: 1px solid #444;
    color: #fff;
    font-family: monospace;
    font-size: 0.85rem;
    padding: 0.3rem 0.7rem;
    cursor: pointer;
    opacity: 0.4;
    transition: opacity 0.2s;
    z-index: 10;
}
#reset:hover { opacity: 1; }