According to this Forum topic, as from Ecommerce Templates v6.7 the div.imagenavigator "PREV 1 of x NEXT" buttons now display as text, instead of the small arrow images.

If you would like to style those PREV and NEXT buttons using colorful CSS, well download this imagenavigator.zip file here.

UPDATED 27 February, 2020.
This CSS scheme uses a dark blue color: #003366 button with dark red color: #b00000 hover. Replace those HEX# colors with whatever suits your website.
The (Enlarge) and (Back to product) links are surrounded by brackets since, at present, they are deliberately coded to appear as plain text, not buttons.

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The more attractive and vastly superior solution for displaying product images, large and giant, is most certainly Magic Slideshow with Autoplay enabled so as your website visitor does not need to click, click, click lotsa buttons.

Gary