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 Search Example</title>

  <style>

    body {

      font-family: sans-serif;

      padding: 1.5rem;

      line-height: 1.6;

    }



    .search-bar {

      display: flex;

      gap: 0.5rem;

      max-width: 480px;

      padding: 1rem;

      background: #f8fafc;

      border: 1px solid #e2e8f0;

      border-radius: 0.35rem;

    }



    .search-input {

      flex-grow: 1;

      padding: 0.6rem 0.85rem;

      border: 1px solid #cbd5e1;

      border-radius: 0.35rem;

      font-size: 1rem;

    }



    .search-btn {

      flex-grow: 0;

      padding: 0.6rem 1.25rem;

      background: #2563eb;

      color: #fff;

      border: none;

      border-radius: 0.35rem;

      font-size: 1rem;

      cursor: pointer;

    }

  </style>

</head>

<body>

  <h1>Expanding Search Input</h1>

  <form class="search-bar" action="#" onsubmit="return false;">

    <input class="search-input" type="search" placeholder="Search topics...">

    <button class="search-btn" type="submit">Search</button>

  </form>

</body>

</html>

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CSS flex-grow Property - Expanding Search Input