.crt::before {
    content: " ";
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(
            rgba(18, 16, 16, 0) 50%,
            rgba(0, 0, 0, 0.25) 50%
        ),
        linear-gradient(
            90deg,
            rgba(255, 0, 0, 0.06),
            rgba(0, 255, 0, 0.02),
            rgba(0, 0, 255, 0.06)
        );
    z-index: 2;
    background-size:
        100% 2px,
        3px 100%;
    pointer-events: none;
}

@keyframes flicker {
    0% {
        opacity: 0.27861;
    }
    5% {
        opacity: 0.34769;
    }
    10% {
        opacity: 0.23604;
    }
    15% {
        opacity: 0.10626;
    }
    20% {
        opacity: 0.18128;
    }
    25% {
        opacity: 0.10626;
    }
    30% {
        opacity: 0.18128;
    }
    35% {
        opacity: 0.23604;
    }
}

.crt::after {
    content: " ";
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: rgba(18, 16, 16, 0.1);
    opacity: 0;
    z-index: 2;
    pointer-events: none;
    animation: flicker 0.15s infinite;
}