index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://fonts.googleapis.com/css2?family=Libre+Caslon+Display&display=swap" rel="stylesheet">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.14.0/css/all.min.css">
    <link rel="stylesheet" href="style.css">
    <title>Todo List</title>
</head>
<body>
   <!-- Header part -->
    <header>
        <h1>My to do List</h1>
    </header>
     <!-- form part -->
    <form action="">
        <input class="todo-input" type="text" placeholder="Todos...">
        <button class="todo-button" type="submit">
            <i class="fas fa-plus-square"></i>
        </button>
          <!-- Selected elements -->
    <div class="select">
        <select name="todos" class="filter-todo">
            <option value="all">All Todos</option>
            <option value="completed">Completed</option>
            <option value="uncompleted">Uncompleted</option>
        </select>
       </div>
    </form>
  
    <!-- Adding elements and deleting them in this list -->
    <div class="todo-container">
        <ul class="todo-list">
          
        </ul>
    </div>

    <script src="demo.js"></script>
</body>
</html>