Hide Tooltip (mouse-cursor hover thingy) for desktop user.

I’m using this code:

#wrap_all #main #portfolio .av-caption-on-hover .av-masonry-item-with-image.av-masonry-entry .av-inner-masonry-content {
    opacity: 0;
}
#wrap_all #main #portfolio .av-caption-on-hover .av-masonry-item-with-image.av-masonry-entry:hover .av-inner-masonry-content {
    opacity: 1;
}

to hide the tool-tip when the mouse-cursor is hovering above an image. The code works fine in most cases.
But it doesn’t work for the gallery and masonry gallery.
Is there a way to hide the tool tip here, too (without losing seo-information) ?

Many thanks in advance.