Fix for Josef

style.css

.child .et_pb_gallery .et_pb_gallery_image {
  border: none;
  width: 100% !important;
}

.child .et_pb_gallery .et_pb_grid_item {
  clear: none !important;
  margin: 0 !important;
  width: 20% !important;
}

@media (max-width: 980px) {
  .child .et_pb_gallery .et_pb_grid_item {
    width: 25% !important;
  }
}

@media (max-width: 767px) {
  .child .et_pb_gallery .et_pb_grid_item {
    width: 33.33333% !important;
  }  
}

@media (max-width: 479px) {
  .child .et_pb_gallery .et_pb_grid_item {
    width: 50% !important;
  }  
}

@media (max-width: 359px) {
  .child .et_pb_gallery .et_pb_grid_item {
    width: 100% !important;
  }  
}