Changing div to css

Hi im new in all this so i would be very happy if someone help me out with this issue.
Ok i want to change certain thing on web page here is what i want to change in css : Slider

And is this correct way to put css:

.unite-gallery.ug-gallery-wrapper.ug-theme-tilesfixed {
height: 0px !important;
}

Result is that i want to remove that slider from certain page.
That slider is connected to another page, listing,so if make changes it is removing it from both pages.