body,html{background:#000000}.container{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);margin:0 auto 0}.button--pulse{position:relative;display:block;border:5px solid #fff;width:75px;height:75px;border-radius:50%;cursor:pointer;-webkit-animation:pulse 1.5s infinite cubic-bezier(0.25,0.46,0.45,0.94);animation:pulse 1.5s infinite cubic-bezier(0.25,0.46,0.45,0.94)}.button--pulse::before{content:'';display:inline-block;width:30px;height:30px;border-radius:50%;background:#CC3333;position:absolute;box-shadow:0 0 0 0 rgba(255,255,255,.5);left:50%;top:50%;-ms-transform:translate(-50%,-50%);-webkit-transform:translate(-50%,-50%);transform:translate(-50%,-50%);-webkit-animation:pulse-shadow 1.5s infinite cubic-bezier(0.25,0.46,0.45,0.94);animation:pulse-shadow 1.5s infinite cubic-bezier(0.25,0.46,0.45,0.94)}@keyframes pulse{0%{transform:scale(.8)}70%{transform:scale(1)}100%{transform:scale(.8)}}@keyframes pulse-shadow{0%{}70%{box-shadow:0 0 0 35px rgba(255,255,255,0)}100%{box-shadow:0 0 0 0 rgba(255,255,255,0)}}