CSS：横向导航栏
横向导航栏（盗版导航栏，B站仿写。）
原视频链接
<html><head><title>demo</title><style>*{margin: 0;padding: 0;list-style: none;text-decoration: none;}body{display: flex;justify-content: center;align-items: center;height: 100vh;width: 100vw;}.nav{width: 1200px;height: 70px;top: 0;box-shadow: 0 5px 20px rgba(0, 0, 0, 0.5);border-radius: 10px;position: relative;}.nav ul{width: 100%;height: 100%;display: flex;align-items: center;justify-content: space-around;}.nav ul .nav-box{position: absolute;bottom: 0;left: 0;/* 导航栏个数 */width: calc((100%/6)*1);height: 10px;border-radius: 2px;transition: 0.5s;}.nav ul li a{color: rgb(70,100,180);font-size: 30px;}.nav ul li:nth-child(1):hover~.nav-box{left: calc(100% / 6 * 0);background-color: aqua;}.nav ul li:nth-child(2):hover~.nav-box{left: calc(100% / 6 * 1);background-color: rgb(16, 212, 91);}.nav ul li:nth-child(3):hover~.nav-box{left: calc(100% / 6 * 2);background-color: rgb(92, 11, 221);}.nav ul li:nth-child(4):hover~.nav-box{left: calc(100% / 6 * 3);background-color: rgb(255, 0, 255);}.nav ul li:nth-child(5):hover~.nav-box{left: calc(100% / 6 * 4);background-color: rgb(255, 0, 13);}.nav ul li:nth-child(6):hover~.nav-box{left: calc(100% / 6 * 5);background-color: rgb(255, 208, 0);}</style></head><body><div class="nav"><ul><li><a href="#">HTML</a></li><li><a href="#">CSS</a></li><li><a href="#">JS</a></li><li><a href="#">Jquery</a></li><li><a href="#">VUE</a></li><li><a href="#">PHP</a></li><div class="nav-box"></div></ul></div></body>
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