* {
  margin: 0;
  padding: 0; }

.mySlider {
  background-color: red;
  color: #FFF; }
  .mySlider__uno {
    background-image: url("../img/banner-contacto.jpg");
    height: 800px;
    background-size: cover; }
  .mySlider__dos {
    background-image: url("../img/banner-nosotros.jpg");
    height: 800px;
    background-size: cover; }
  .mySlider__tres {
    background-image: url("../img/banner-servicios.jpg");
    height: 800px;
    background-size: cover; }