body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--scan-width);
    background: var(--scan-color);
    opacity: var(--scan-opacity);
    z-index: var(--crt-z-index);
    pointer-events: none;
    animation: crt-scan-moving 6s linear infinite;
}

body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        to bottom,
        transparent 50%,
        var(--scan-color) 51%
    );
    background-size: 100% calc(var(--scan-width) * 2);
    z-index: calc(var(--crt-z-index) - 1);
    pointer-events: none;
    animation: crt-static 1s steps(60) infinite;
}

@keyframes crt-scan-moving {
    0% {
        transform: translate3d(0, 0, 0);
    }
    100% {
        transform: translate3d(0, 100vh, 0);
    }
}

@keyframes crt-static {
    0% {
        background-position: 0 50%;
    }
}