@keyframes pulse-animation{0%,to{box-shadow:0 0 #ff00001a}50%{box-shadow:0 0 5px 5px #ff00004d}}.led{animation:pulse-animation 2s infinite;background:radial-gradient(circle,red 0,#f009 70%,#f000);border-radius:50%;height:10px;position:relative;width:10px}