Untitled

<?php
session_start();
require_once 'usuarios.php';
$usuarios = new Usuarios();

if(empty($_POST['email'])) {
    $email = addslashes($_POST['email']);
    $senha = addslashes(($_POST['senha']));

    if($usuarios->logar($email, $senha)){
        header("Location: index.php");
        exit;
    } else{
        echo "Email e/ou senha incorretos";
    }
}
?>

<!DOCTYPE html>
<html lang="pt-br">
<head>
    <?php
        require 'header.php';
    ?>
</head>
<body>
    <div class="container d-flex flex-column align-items-center">
        <h1 class="center text-center text-success mt-4">Marketing Multínivel</h1>
        <div class="col-12 col-sm-8 col-md-6 col-lg-4  mt-4">
            <form method="POST">
                <div class="form-group">
                    <label for="email">Endereço de e-mail</label>
                    <input type="email" name="email" class="form-control" placeholder="Informe seu e-mail" required>
                </div>
            <div class="form-group">
                <label for="exampleInputPassword1">Senha</label>
                <input type="password" name="senha" class="form-control" placeholder="Informe sua senha" required>
            </div>
            <div class="d-flex justify-content-center">
                 <input type="submit" class="btn btn-primary btn-lg mt-3" value="Logar">
            </div>
            </form>
        </div>
    </div>
</body>
</html>