projet_programmation_web/ProjetProgWeb/navbar.php

<header>
    <nav class="navbar">
        <h1>theses.fr</h1>
        <form action="index.php" method="POST" class="navbar-input">
            <input type="text" name="author" placeholder="nom auteur">
            <button>
                <img src="assets/search.svg" alt="search">
            </button>
        </form>
    </nav>
</header>