HTML部分
<ul> <li><a href="">第一条</a></li> <li><a href="">第二条</a></li> <li><a href="">第三条</a></li> <li><a href="">第四条</a></li> <li><a href="">第五条</a></li> </ul>
CSS部分
ul { display: flex; position: absolute; width: 800px; top: 50%; left: 50%; transform: translate(-50%, -50%); } li { position: relative; padding: 20px; font-size: 24px; color: #000; line-height: 1; transition: 0.2s all linear; cursor: pointer; } li::before { content: ""; position: absolute; top: 0; left: 100%; width: 0; height: 100%; border-bottom: 2px solid #000; transition: 0.2s all linear; } li:hover::before { width: 100%; top: 0; left: 0; transition-delay: 0.1s; border-bottom-color: #000; z-index: -1; } li:hover ~ li::before { left: 0; } li:active { background: #000; color: #fff; }
减效是这样,具体好看的样式还是要自己动动小手