.wave-button{color:#000;cursor:pointer;background-color:#fff;border:2px solid #ddd;border-radius:5px;padding:15px 30px;font-size:16px;transition:all .3s;position:relative;overflow:hidden}.wave-button:before{content:"";background-color:#639;width:0;height:0;transition:all .5s;position:absolute;bottom:0;right:0;box-shadow:0 0 40px #fff6}.wave-button:hover{background-color:#ddd;border-color:#639}.wave-button:hover:before{width:100%;height:5%;animation:.5s linear forwards wave-animation}@keyframes wave-animation{to{right:100%}}.wave-button span{z-index:1;position:relative}