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丝滑.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        body{

            background-color: #2c3e50;
        }
        nav{
            margin: 100px auto;
            position: relative;
            width: 500px;
            height: 50px;
            background-color: #34495e;
            border-radius: 8px;
            font-size: 0;
            box-shadow: 2px 2px 2px #000;
        }

        nav a{
            width: 100px;
            height: 100%;
            line-height: 50px;
            font-size: 15px;
            display: inline-block;
            position: relative;
            z-index: 1;
            text-decoration: none;
            text-transform: uppercase;
            text-align: center;
            color: white;
            cursor: pointer;
            /* border: 1px solid red; */
        }

        nav .animation{
            position: absolute;
            height: 100%;
            width: 100px;
            top: 0;
            left: 0;

            z-index: 0;
            transition: all 1s ease 0s;
            border-radius: 8px;
            background-color: #1abc9c;

        }

        /* a标签 和.animation类 是同级兄弟
              所以  ~ 表示是CSS选择器的兄弟组合器
        */

        /* 在a标签区域内滑动，效果呈现出连续性 */
        nav a:nth-child(1):hover~.animation{
            left: 0;
            background-color: #1abc9c;
        }
        nav a:nth-child(2):hover~.animation{
            left: 100px;
            background-color: #e74c3c;
        }
        nav a:nth-child(3):hover~.animation{
            left: 200px;
            background-color: #3498db;
        }
        nav a:nth-child(4):hover~.animation{
            left: 300px;
            background-color: #9b59b6;
        }
        nav a:nth-child(5):hover~.animation{
            left: 400px;
            background-color: #e67e22;
        }

    </style>
</head>

<body>

    <nav>
        <a href="#">Home</a>
        <a href="#">About</a>
        <a href="#">Blog</a>
        <a href="#">News</a>
        <a href="#">Contact</a>

        <div class="animation"></div>
    </nav>

</body>

</html>