body{background:green;font-family:sans-serif}.sound-button,header{text-align:center}.sound-button{width:160px;height:160px;display:flex;justify-content:center;align-items:center;background:#588cdb}.sound-button:hover{cursor:pointer;font-size:28px}.row{display:flex;flex-wrap:wrap;margin-right:-15px;margin-left:-15px;color:#87ceeb}.button-disabled{border-color:grey!important;background-color:#d3d3d3}.button-disabled:hover{cursor:not-allowed;font-size:1rem}.custom-control .custom-control-input:checked:after{background-color:green!important}