header{height:80px;background-color:#222}header>div{display:flex;align-items:center;margin:0 auto;width:80%;height:100%}header>div nav a{position:relative}header>div nav a:after{position:absolute;bottom:0;left:0;content:"";width:0;height:2px;border-radius:2px;background-color:#fff;transition:width .2s}header>div nav a:hover:after{width:100%}header>div nav a+a{margin-left:12px}._app-layout_mfdg8_1>header{margin-bottom:24px}*{margin:0;padding:0;border:0;box-sizing:border-box}body{font-family:Arial,Helvetica,sans-serif;background-color:#333;color:#fff}a{text-decoration:none;color:inherit}button{cursor:pointer}