body {
    padding: 0;
    margin: 0;
    height: 100vh;
}

canvas {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: #000;
    background-image: linear-gradient(to top, rgba(0, 169, 217, .7) 0%,
    rgba(0, 169, 217, .5) 5%, rgba(0, 169, 217, .0) 70%);
}