.glow-button{position:relative}.glow-button:before{content:"";position:absolute;top:-2px;left:-2px;background:linear-gradient(45deg,red,#ff4d00,#ff9100,#00ff37,#00ffd5,#0051ff,#7a00ff,#ff00c8,red);background-size:400%;z-index:-1;filter:blur(8px);width:calc(100% + 4px);height:calc(100% + 4px);animation:glowing 20s linear infinite;opacity:0;transition:opacity .3s ease-in-out;border-radius:10px}.glow-button.active:before{opacity:1}@keyframes glowing{0%{background-position:0 0}50%{background-position:400% 0}to{background-position:0 0}}