三列等高 css

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>三列等高布局</title>
    <style>
        .container {
            display: flex;
            height: 100vh; /* 设置容器高度为视口高度 */
        }
        .column {
            flex: 1;
            border: 1px solid #ccc;
            padding: 20px;
            box-sizing: border-box;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="column">侧边栏1</div>
        <div class="column">主要内容区域</div>
        <div class="column">侧边栏2</div>
    </div>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>三列等高布局</title>
    <style>
        .container {
            display: grid;
            grid-template-columns: 1fr 2fr 1fr; /* 设置三列等宽 */
            height: 100vh; /* 设置容器高度为视口高度 */
        }
        .column {
            border: 1px solid #ccc;
            padding: 20px;
            box-sizing: border-box;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="column">侧边栏1</div>
        <div class="column">主要内容区域</div>
        <div class="column">侧边栏2</div>
    </div>
</body>
</html>