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

body{
    overflow: hidden; /* no scroll bar */
}

#canvas {
    background-color: lightblue;
    display: block;
    margin-top: 50px;
    margin-left: auto;
    margin-right: auto;
}

div {
    display:none;
}