body {
      font-family: Arial, sans-serif;
      background: #f4f4f4;
      padding: 20px;
      max-width: 600px;
      margin: auto;
    }
    h2 {
      text-align: center;
    }
    form {
      background: #fff;
      padding: 15px;
      border-radius: 5px;
      margin-bottom: 20px;
    }
    input[type="text"], input[type="url"] {
      width: 100%;
      padding: 10px;
      margin: 8px 0;
      box-sizing: border-box;
    }
    button {
      padding: 10px;
      background: #3498db;
      color: white;
      border: none;
      cursor: pointer;
    }
    button:hover {
      background: #2980b9;
    }
    .bookmark {
      background: white;
      padding: 10px;
      margin-bottom: 10px;
      border-left: 5px solid #3498db;
    }
    .bookmark a {
      text-decoration: none;
      color: #3498db;
      font-weight: bold;
    }
    .delete-btn {
      float: right;
      color: red;
      cursor: pointer;
    }