body {
    background-size: 200% 100% contain;
    background-position: top center;
    background-repeat: no-repeat;
    background-blend-mode: lighten;
    background-color: black;
    font-family: Onyx, Impact, Haettenschweiler, 'Arial Narrow Bold', sans-serif, Verdana, Geneva, Tahoma, sans-serif;
    text-align: center;
    font-size: x-large;
    animation: crt-flicker 6s infinite;
}

    body::after {
        content: "";
        pointer-events: none;
        position: fixed;
        inset: 0;
        background: repeating-linear-gradient( to bottom, rgba(0,0,0,0) 0px, rgba(0,0,0,0.25) 3px, rgba(0,0,0,0.25) 4px );
        z-index: 999;
    }