Add CRT scanlines, screen flicker and color separation effects

crt.css

/*Stolen from http://aleclownes.com/2017/02/01/crt-display.html*/

/*This adds a "crt scanlines" effect to the screen*/
.crt-scanlines::before {
        content: " ";
        display: block;
        position: absolute;
        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), rgb
a(0, 0, 255, 0.06));
        z-index: 2;
        background-size: 100% 2px, 3px 100%;
        pointer-events: none;
}

/*This adds a "flickering screen" effect*/
.crt-flicker::after {
        content: " ";
        display: block;
        position: absolute;
        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;
}

@keyframes flicker {
        0% {opacity: 0.27861;}
        5% {opacity: 0.34769;}
        10% {opacity: 0.23604;}
        15% {opacity: 0.90626;}
        20% {opacity: 0.18128;}
        25% {opacity: 0.83891;}
        30% {opacity: 0.65583;}
        35% {opacity: 0.67807;}
        40% {opacity: 0.26559;}
        45% {opacity: 0.84693;}
        50% {opacity: 0.96019;}
        55% {opacity: 0.08594;}
        60% {opacity: 0.20313;}
        65% {opacity: 0.71988;}
        70% {opacity: 0.53455;}
        75% {opacity: 0.37288;}
        80% {opacity: 0.71428;}
        85% {opacity: 0.70419;}
        90% {opacity: 0.7003;}
        95% {opacity: 0.36108;}
        100% {opacity: 0.24387;}
}

/*Adds a "color separation flicker" effect to all text*/
.crt-colorsep {
        animation: textShadow 1.6s infinite;
}

@keyframes textShadow {
        0% {text-shadow: 0.4389924193300864px 0 1px rgba(0,30,255,0.5), -0.4389924193300864px 0 1px rgba(255,0,80,0.3), 0 0 3px;}
        5% {text-shadow: 2.7928974010788217px 0 1px rgba(0,30,255,0.5), -2.7928974010788217px 0 1px rgba(255,0,80,0.3), 0 0 3px;}
        10% {text-shadow: 0.02956275843481219px 0 1px rgba(0,30,255,0.5), -0.02956275843481219px 0 1px rgba(255,0,80,0.3), 0 0 3px;}
        15% {text-shadow: 0.40218538552878136px 0 1px rgba(0,30,255,0.5), -0.40218538552878136px 0 1px rgba(255,0,80,0.3), 0 0 3px;}
        20% {text-shadow: 3.4794037899852017px 0 1px rgba(0,30,255,0.5), -3.4794037899852017px 0 1px rgba(255,0,80,0.3), 0 0 3px;}
        25% {text-shadow: 1.6125630401149584px 0 1px rgba(0,30,255,0.5), -1.6125630401149584px 0 1px rgba(255,0,80,0.3), 0 0 3px;}
        30% {text-shadow: 0.7015590085143956px 0 1px rgba(0,30,255,0.5), -0.7015590085143956px 0 1px rgba(255,0,80,0.3), 0 0 3px;}
        35% {text-shadow: 3.896914047650351px 0 1px rgba(0,30,255,0.5), -3.896914047650351px 0 1px rgba(255,0,80,0.3), 0 0 3px;}
        40% {text-shadow: 3.870905614848819px 0 1px rgba(0,30,255,0.5), -3.870905614848819px 0 1px rgba(255,0,80,0.3), 0 0 3px;}
        45% {text-shadow: 2.231056963361899px 0 1px rgba(0,30,255,0.5), -2.231056963361899px 0 1px rgba(255,0,80,0.3), 0 0 3px;}
        50% {text-shadow: 0.08084290417898504px 0 1px rgba(0,30,255,0.5), -0.08084290417898504px 0 1px rgba(255,0,80,0.3), 0 0 3px;}
        55% {text-shadow: 2.3758461067427543px 0 1px rgba(0,30,255,0.5), -2.3758461067427543px 0 1px rgba(255,0,80,0.3), 0 0 3px;}
        60% {text-shadow: 2.202193051050636px 0 1px rgba(0,30,255,0.5), -2.202193051050636px 0 1px rgba(255,0,80,0.3), 0 0 3px;}
        65% {text-shadow: 2.8638780614874975px 0 1px rgba(0,30,255,0.5), -2.8638780614874975px 0 1px rgba(255,0,80,0.3), 0 0 3px;}
        70% {text-shadow: 0.48874025155497314px 0 1px rgba(0,30,255,0.5), -0.48874025155497314px 0 1px rgba(255,0,80,0.3), 0 0 3px;}
        75% {text-shadow: 1.8948491305757957px 0 1px rgba(0,30,255,0.5), -1.8948491305757957px 0 1px rgba(255,0,80,0.3), 0 0 3px;}
        80% {text-shadow: 0.0833037308038857px 0 1px rgba(0,30,255,0.5), -0.0833037308038857px 0 1px rgba(255,0,80,0.3), 0 0 3px;}
        85% {text-shadow: 0.09769827255241735px 0 1px rgba(0,30,255,0.5), -0.09769827255241735px 0 1px rgba(255,0,80,0.3), 0 0 3px;}
        90% {text-shadow: 3.443339761481782px 0 1px rgba(0,30,255,0.5), -3.443339761481782px 0 1px rgba(255,0,80,0.3), 0 0 3px;}
        95% {text-shadow: 2.1841838852799786px 0 1px rgba(0,30,255,0.5), -2.1841838852799786px 0 1px rgba(255,0,80,0.3), 0 0 3px;}
        100% {text-shadow: 2.6208764473832513px 0 1px rgba(0,30,255,0.5), -2.6208764473832513px 0 1px rgba(255,0,80,0.3), 0 0 3px;}
}