.crt:before{content:" ";display:block;position:absolute;top:0;left:0;bottom:0;right:0;background:linear-gradient(hsla(0,6%,7%,0) 50%,rgba(0,0,0,.25) 0),linear-gradient(90deg,rgba(255,0,0,.06),rgba(0,255,0,.02),rgba(0,0,255,.06));z-index:2;background-size:100% 2px,3px 100%;pointer-events:none}