<div style="background-color: black;width:1920px; height:1020px;">
  <div class="container text-center">
    <div class="row">
      <div class="col-12">
        <form>
          <div class="form-group">
            <input type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp"
              placeholder="Usuario">
          </div>
          <div class="form-group">
            <input type="password" class="form-control" id="exampleInputPassword1" placeholder="Contraseña">
          </div>
          <button type="submit" class="btn btn-primary">Entrar</button>
        </form>
      </div>
    </div>
  </div>
</div>