body {
    background-color: rgba(42, 61, 65, .8);
    box-sizing: border-box;
}

main {
    margin: 2rem;
    padding: 0;
    display: flex;
    justify-content: center; 
}

#canvas-container {
    height: 604px;
    width: 904px;
    border: 2px solid rgba(228, 213, 180, .5);
    display: block;
}