.hero-single-actividad {
  background: url('assets/images/hero/actividad_single.jpg') center/cover no-repeat;
  height: 430px;
  position: relative;
}
.hero-single-actividad .overlay {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: rgba(0,0,0,0.5);
}