body {
    background-color: #0000FF;
    color: #fff;
    text-align: center;
}

canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

@media only screen and (max-width: 991px) {
   
	 body {
    background-color: #0000FF;
    color: #fff;
    text-align: center;
}

.middle{
 margin-top: 350px !important;
}

canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}
}