.switch{position:relative;display:inline-block;width:51px;height:30px}.switch input{opacity:0;width:0;height:0}.slider{cursor:pointer;top:0;left:0;right:0;bottom:0;background-color:#515151}.slider,.slider:before{position:absolute;transition:.3s}.slider:before{content:"";height:24px;width:24px;left:3px;bottom:3px;background-color:#fff}input:checked+.slider{background-color:#ff3f3f}input:focus+.slider{box-shadow:0 0 1px #2196f3}input:checked+.slider:before{transform:translateX(21px)}.slider.round{border-radius:100px}.slider.round:before{border-radius:50%}