HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

  <meta name="viewport" content="width=device-width, initial-scale=1.0">

  <title>CSS flex-grow Sidebar Example</title>

  <style>

    body {

      font-family: sans-serif;

      padding: 1.5rem;

      line-height: 1.6;

    }



    .layout {

      display: flex;

      gap: 1rem;

      min-height: 160px;

      padding: 1rem;

      background: #f8fafc;

      border: 1px solid #e2e8f0;

      border-radius: 0.35rem;

    }



    .sidebar {

      flex-grow: 0;

      width: 180px;

      padding: 1rem;

      background: #e2e8f0;

      border-radius: 0.35rem;

    }



    .main {

      flex-grow: 1;

      padding: 1rem;

      background: #dbeafe;

      border-radius: 0.35rem;

    }

  </style>

</head>

<body>

  <h1>Main + Sidebar Layout</h1>

  <div class="layout">

    <aside class="sidebar">Sidebar (fixed width)</aside>

    <main class="main">Main content (grows to fill space)</main>

  </div>

</body>

</html>

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CSS flex-grow Property - Main + Sidebar Layout