Ex-1-css

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <link rel="stylesheet" href="css/ex-1.css">
</head>

<body>

  <nav>
    <a href="#">Home</a>
    <a href="#">Clientes</a>
    <a href="#">Produtos</a>
    <a href="#">Contato</a>
  </nav>


</body>

</html>