button:before{background:linear-gradient(90deg,rgba(255,255,255,.2) 0,rgba(255,255,255,.2) 20px,rgba(255,255,255,0) 0);animation:shine 10s infinite}@keyframes shine{0%{transform:skewX(-45deg) translateX(-100%)}20%{transform:skewX(-45deg) translateX(100%)}to{transform:skewX(-45deg) translateX(100%)}}