It looks like they might not be centered because of that wiki using europa, but you can use this css to center the tabs in the infobox:
.pi-europa .pi-image-collection-tabs { text-align: center; }
Thank you! But how make them look like in your wiki? Now titles look mashed together in one word.
The tabs look like that because of this css that you have in your MediaWiki:Wikia.css:
.portable-infobox .pi-item-spacing { padding:0; }
Try removing it and waiting like 20 minutes, and then seeing if it works after you refresh with wikipedia:WP:REFRESH