html{
    font-size: 62.5%;
}

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    background-color: black
}

#canvas{

    border: 3px solid white;
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}