*{background-color:#252424}nav{padding:10px 0;display:flex;justify-content:center;gap:50px}nav button{background:none;border:none;color:#fff;font-size:16px;font-weight:400;padding:5px 0;position:relative;transition:color .3s}nav button:after{content:"";position:absolute;left:0;bottom:-2px;width:0%;height:2px;background-color:#fff;transition:width .3s ease-in-out}nav button:hover:after{width:100%}nav button.active{font-weight:700}nav button.active:after{width:100%}