#app{font-family:Avenir,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-align:center;color:#2c3e50;margin-top:60px}.sound-table{width:80%;margin:0 auto}table{width:100%;border-collapse:collapse}td,th{border:1px solid #ddd;padding:8px}th{background-color:#f2f2f2}.btn-class{float:left;margin-bottom:20px}