.sound-button.playing:after,.sound-button.playing:before{content:"";position:absolute;border-radius:50%;width:100%;height:100%;top:0;left:0;background-color:#e6f0ff;z-index:1;animation:pulse 2s infinite}.sound-button.playing:after{animation-delay:.1s}@keyframes pulse{0%{transform:scale(1);opacity:.7}to{transform:scale(1.5);opacity:0}}