<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8'>
<meta http-equiv='X-UA-Compatible' content='IE=edge'>
<title>PSD-06t-Lenize</title>
<meta name='viewport' content='width=device-width, initial-scale=1'>
<link rel='stylesheet' type='text/css' media='screen' href='main.css'>
<script src='main.js'></script>
</head>
<body><div class="container">
<h1>Formulário de Cadastro</h1>
<br />
<h3>Dados Empresa</h3>
<form name="formcadastro" action="enviar.php" method="post" onsubmit="return confirmacao()">
<div class="form-group">
<label>Nome da Empresa</label><br />
<input type="text" name="nome_empresa" id="nome_empresa" id="nome_empresa" required="" placeholder="Digite o nome" class="form-control" />
<br />
</div>
<div class="form-group">
<label>Endereço da Empresa</label>
<br />
<input type="text" name="endereco_empresa" id="endereco_empresa" id="endereco_empresa" required="" placeholder="Digite o endereço" class="form-control" />
<br />
</div class="form-group">
<div>
<label>Telefone da Empresa</label><br />
<input type="text" name="telefone_empresa" id="telefone_empresa" id="telefone_empresa" required="" placeholder="00000-0000" class="form-control" />