JSFiddle - React, Tailwind, and code Playground

HTML

<form name="formlogin" action="logar.php" method="POST" id="formlogin" class="form_login">
                        <fieldset>
                        <div>
                            Login&nbsp;&nbsp;&nbsp;<input type="text" name="login" ID="login">
                        <br /><br />
                        Senha:&nbsp;<input type="password" name="senha" id="senha">
                        <br /><br />
                        <input type="reset" class="pull-left btn btn-primary" value="Cancelar" />
                        <input type="submit" class="pull-right btn btn-primary" value="Logar"/>
                        </div>
                        </fieldset>
                    </form>

JavaScript

<?php

session_start();
$login = $_POST['login'];
$senha = $_POST['senha'];

$con =  mysql_connect("localhost", "giga", "g1g@") or die(mysql_error());
$select = mysql_select_db("gigaline") or die(mysql_error());

$result = "Select * from pv_usuario where email = '$login' and senha = '$senha'";
$sql_execute = mysql_query($result);
$sql_verifica = mysql_num_rows($sql_execute);
if($sql_verifica > 0)
{
    session_start();
    $_SESSION['login'] = $login;
    $_SESSION['senha'] = $senha;
    header('location:questionario_pos_venda.php');
    exit;
}
else 
    {
        session_destroy();
        unset($_SESSION['login']);
        unset($_SESSION['senha']);
        header('location:acesso_negado.php');
        exit;
    }