ul.contact > li::after,
  ul li.contact::after      { mask-image: url(https://ketriweb.com/res/file/0a28f080/178382b1/icon-contact-form.svg);  }

  ul.slider > li::after,
  ul li.slider::after       { mask-image: url(https://ketriweb.com/res/file/0a28f080/4212228f/icon-layout.svg);   }

  ul.gallery > li::after,
  ul li.gallery::after      { mask-image: url(https://ketriweb.com/res/file/0a28f080/60a94af0/icon-gallery.svg);  }