.electric-bar{position:relative;overflow:hidden;background:#000}.electric-bar::before{content:"";position:absolute;top:50%;left:-100%;width:200%;height:4px;background:linear-gradient(90deg,transparent,#00ccff,#0ef,#00ccff,transparent);box-shadow:0 0 20px #00ccff,0 0 40px #0099ff;animation:electricSweep 2s linear infinite}@keyframes electricSweep{0%{left:-100%}100%{left:100%}}