@keyframes fadein {
    0% {
        opacity: 0;
    }

    50% {
        opacity: 0;
    }

    100% {
        opacity: 1;
    }
}

canvas {
    animation: fadein 5s;
    position: absolute;
    top: 0;
    left: 0;
}

body,
html {
    width: 100%;
    height: 100%;
    overflow: hidden;
    margin: 0;
    padding: 0;
    background: black;
}