.formulario {
  background: #333;
  width: 400px;
  padding: 10px 20px;
  box-sizing: border-box;
  border-radius: 8px;
  margin-left: 5%;
}
.formulario h2 {
  color: white;
  text-align: center;
  margin: 0px;
  margin-bottom: 20px;
}
.formulario input {
  width: 100%;
  margin-bottom: 20px;
  padding: 8px;
  box-sizing: border-box;
  font-size: 17px;
  border: none;
}

#btnloguearte {
  background: #133f7f;
  color: white;
  font-size: 20px;
}
#btnloguearte:hover {
  cursor: pointer;
  background: #0069ff;
  transition: 0.5s;
}
.divFormulario {
  display: flex;
  justify-content: center;
  margin-top: 10px;
}

@media (max-width: 1000px) {
  .divFormulario {
    width: 100%;
    display: inline-block;
  }
  .formulario {
    margin-top: 50px;
    width: 100%;
    margin-left: auto;
  }
  iframe {
    width: 100%;
    height: 400px;
  }
  #btnFactura {
    font-size: 15px;
    width: 50%;
    background: #e8551c;
    color: white;
  }
  .factura input {
    font-size: 15px;
  }
}