左侧自适应css

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>左侧自适应布局</title>
    <style>
        .container {
            display: flex;
            height: 100vh;
        }
        .left-sidebar {
            flex: 1;
            background-color: #f0f0f0;
            padding: 20px;
        }
        .main-content {
            flex: 3;
            padding: 20px;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="left-sidebar">
            <h2>左侧侧边栏</h2>
            <p>这是一个自适应的左侧侧边栏。</p>
        </div>
        <div class="main-content">
            <h2>主要内容</h2>
            <p>这是主要内容区域。</p>
        </div>
    </div>
</body>
</html>