html,body{margin:0;padding:0}html{box-sizing:border-box}*,*:before,*:after{box-sizing:inherit}.Metronome{max-width:800px;margin:auto;text-align:center}.tempo{font-size:60px;margin-bottom:20px;cursor:pointer}.controls{display:flex;width:360px;margin:auto}.slider{width:300px;margin:auto}button{margin:10px}.Timer{text-align:center;font-size:40px;cursor:pointer}