input[type=radio]{appearance:none;background-color:#fff;border:.1em solid #fff;border-radius:50%;width:20px;height:20px;margin:0;transition:background-color .2s,border-color .2s}input[type=radio]:checked{background-color:#fff;border-color:#fff}input[type=radio]:checked:after{content:"";background-color:#000;border-radius:50%;width:14px;height:14px;margin:2px auto;display:block}