body {
    margin: 0px;
    overflow: hidden;
    background: black;
    min-width: 408px;
}
 
.background {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0px;
    left: 0px;
    opacity: 1;
    text-align: center; 
}

canvas {
    width: 100%;
    height: 100%;
    z-index: 10;
    position: relative;
}