.img-slider {
  filter: brightness(50%) !important;
  height: 100vh !important;
  max-height: 100vh;

}

  @media (max-width: 768px) { 
    .img-slider {
    filter: brightness(50%) !important;
    height: 100vh !important;
    max-height: 70vh !important;
  }
  }
  @media (max-width: 576px) { 
    .img-slider {
      margin-top: 50px !important;
    filter: brightness(50%) !important;
    height: 100vh !important;
    max-height: 50vh !important;
  }
  }