Navigation chars > of 'webcomic' plugin loose format in CatchBox theme

Hi. I need to use a theme with multilingual files already included, in my case, I’m using Catch Box.
The plugin called: ‘webcomic’ works fine, and I can load images and create the classifications.
But the characters to navigate between images appear without format (< << ∞ >> >), that is, the characters with the respective links are not shown with big sizes and properly distributed above the picture.
If I change the theme to inkblot, the navigation characters have the proper size, frame and are distributed nicely. How can I preserve the same aesthetic effect with other themes like Catch Box?
Thanks.