.contenedor-responsive {
  position: relative;
  padding-bottom: 56.25%;
  padding-top: 30px;
  height: 0;
  overflow: hidden;
}

.contenedor-responsive iframe,
.contenedor-responsive object,
.contenedor-responsive embed {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}