.sound-volume-btn{--sound-volume-icon-size:80%;color:#fff;cursor:pointer;display:block;position:relative;-webkit-user-select:none;-moz-user-select:none;user-select:none;width:40px}.sound-volume-btn:before{content:"";display:block;padding-bottom:100%}.sound-volume-btn__icon{display:block;height:var(--sound-volume-icon-size);left:50%;position:absolute;top:50%;transform:translate(-50%,-50%);width:var(--sound-volume-icon-size)}