index.html

<!DOCTYPE html>
<html lang="fr">
    <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>To do</title>
        <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.12.0/css/all.css" />
        <link rel="stylesheet" href="screen.css">
    </head>
    <body>
        <header>
            <h1>to do</h1>
        </header>
        <main class="todo-wrapper">
            <form class="add-todo">
                <input type="text"  class="todo-input" placeholder="Tâche à faire...">
                <button type="submit" class="todo-btn"><i class="fas fa-plus"></i></button>
            </form>
            <section class="todo-container">
                <ul class="todo-list">
                </ul>
            </section>        
        </main>
        <script src="app.js"></script>
    </body>
</html>