#page-slider.slider-static{
    position:relative;
    background-repeat:no-repeat;
    background-position:center;
    background-size:cover;
    width: 100%;
    padding-bottom: 25%;
    overflow:hidden;
}

#page-slider.slider-static .slider-image-background{
  width:100%;
  position:absolute;
  top: 50%;
  left: 50%;
  transform: translateY(-50%) translateX(-50%);
}