add-task-modal.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Trip</title>
    <link rel="stylesheet" href="add-task-modal.css" />
    <script
      src="https://kit.fontawesome.com/61e5528767.js"
      crossorigin="anonymous"
    ></script>
  </head>
  <body>
    <div class="container1">
      <div class="line"></div>
      <div class="heading">Trip To Paris</div>
      <div class="line"></div>
    </div>
    <div class="container2">
        <a href="index.html">
        <i class="fas fa-arrow-circle-left"></i>
        <span class="text1">Back</span>
    </a> 
    </div>
    <div class="container3">
        <div class="item">
            <div class="item-head">
                Trip To Paris</div>
            <hr>
            <ul>
                <li class="task1">Completed Task</li>
                <li>
                    <input type="checkbox" name="" id="pt1">
                    <label for="pt1">Pending Task</label>
                </li>
            </ul>
            <i class="fas fa-plus-circle"></i>
        </div>
    </div>
    <div class="bg-modal">
        <div class="modal-content">
            <div class="close"><i class="far fa-times-circle"></i></div>
            <span class="list-title">Add New List</span> <br>
            <input type="text" class="list-input"> <br>
            <button type="submit" class="add-list-btn">Add</button>
        </div>
    </div>
  </body>
</html>