just a suggestion, but could you just center the banners one on top of each other?
The way you have them now. They are too small and get lost compared with the rest of the wiki (icons and other banners). Or something like making each of them to have twice the width.
And well, its 2017. There is a lot of people with 1920x1080 and 2560x1080 screen resolution. Those tiny banners are just too small lol. Plus those banners are well designed, they're something pleasant to look at, so having them a little bigger would be nice.