Обход
CSS
#navbardrop{
font-size: 1.25rem;
}
#admin_menu {
font-weight: 700!important;
margin-bottom: .25rem;
margin-top: .25rem;
}
h3{
font-size: 1.25rem;
}
.dropdown-toggle::after{
display: none;
}
h4{
font-size: 1rem;
}
HTML
<div class="nav_container">
<nav class="navbar navbar-expand-sm bg-dark navbar-dark fixed-top">
<div class="d-flex align-items-center">
<a class="navbar-brand" href="homepage"><img id="logo" src="images/logo.jpg"></a>
</div>
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link text-uppercase" href="index.php"><h3 class="font-weight-bold">Accueil</h3></a>
</li>
<li class="nav-item">
<a class="nav-link" href="add_mat.php"><h3 class="font-weight-bold">Ajout Matériel</h3></a>
</li>
<li class="nav-item">
<a class="nav-link" href="add_cat.php"><h3 class="font-weight-bold">Ajout Catégorie</h3></a>
</li>
<li class="nav-item">
<a class="nav-link" href="add_type.php"><h3 class="font-weight-bold">Ajout Type</h3></a>
</li>
<li class="nav-item">
<a class="nav-link" href="add_model.php"><h3 class="font-weight-bold">Ajout Modèle</h3></a>
</li>
<!-- Admin -->
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbardrop" data-toggle="dropdown">
<h3 id="admin_menu">Admin <span class="fas fa-angle-down"></span></h3>
</a>
<div class="dropdown-menu">
<a class="dropdown-item" href="../update_data.php"><h4>Update Data</h4></a>
<a class="dropdown-item" href="../bd_tables.php"><h4>Tableaux BD</h4></a>
</div>
</li>
</ul>
</nav>
</div>
Результат