css 导航a标签设border距离，要设display:block

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

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    * {
        margin: 0;
        padding: 0;
    }

    ul {
        list-style: none;
    }

    a {
        text-decoration: none;
    }

    .container {
        width: 1240px;
        height: 900px;
        margin: 0 auto;
        /* background-color: pink; */
    }

    .nav {
        width: 100%;
        /* .nav ul li a设高度看这里 */
        height: 50px;
        background-color: skyblue;
    }

    .nav ul {
        display: flex;

    }

    .nav ul li {
        margin: 0 30px;
    }

    .nav ul li a {
        /* 这里要设块 因为行内元素 */
        display: block;
        /* 设高度和行高 让其居中 50px要对应上面的.nav的height*/
        height: 50px;
        line-height: 50px;

        color: black;
    }

    .nav ul .active {
        color: purple;

        border-bottom: 2px solid purple;
    }
</style>

<body>
    <div class="container">
        <div class="nav">
            <ul>
                <li><a href="#" class="active">首页</a></li>
                <li><a href="#">首页</a></li>
                <li><a href="#">首页</a></li>
                <li><a href="#">首页</a></li>
                <li><a href="#">首页</a></li>
            </ul>
        </div>

    </div>

</body>

</html>
运行结果：
css 导航a标签设border距离，要设display:block

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