Já coloquei algumas tags do Bootstrap mas nada. o que pode ser?
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" type="text/css" href="/css/app.css">
<link href="/css/app.css" rel="stylesheet">
<title>Supervisor de Turmas</title>
</head>
<body>
<div class="container">
<h1>Lista de Alunos</h1>
<table class="table table-striped table-bordered table-hover">
<?php foreach($alunos as $a): ?>
<tr>
<td>nome : <?= $a->nome ?> </td>
<td>email : <?= $a->email ?></td>
<td>celular : <?= $a->celular ?></td>
<td>cpf : <?= $a->cpf ?></td>
<td>nascimento : <?= $a->nascimento ?></td>
</tr>
<?php endforeach ?>
</table>
</div>
</body>
</html>
