:root{--gradient-shadow:linear-gradient(45deg, #86befd, #8eda8e, #1081d2, #63f659, #0507b4, #5986f6, #6cf66c, #acffa0, #108bc9)}body{background:#fff;justify-content:center;align-items:center;height:100vh;margin:0;padding:0;display:flex}.shadow{text-align:center;background:#fff;border-radius:50%;justify-content:center;align-items:center;width:180px;height:180px;display:flex;position:relative}.shadow:before,.shadow:after{content:"";background:var(--gradient-shadow);z-index:-1;background-size:400%;border-radius:50%;width:calc(100% + 4px);height:calc(100% + 4px);animation:20s linear infinite animate;position:absolute;top:-2px;left:-2px}.shadow:after{filter:blur(20px)}@keyframes animate{0%{background-position:0 0}50%{background-position:300% 0}to{background-position:0 0}}