How to style pagination?

I'm using plugin v1.2.3 and BS3 template v1.2.3.
I would like to add CSS classes to start/previous/next/end links in pagination.
I've copied pagination.php from plugins/system/t3/base-bs3/html folder to templates/t3_bs3_blank/html folder.
It looks like tags are hardcoded somewhere inside plugin.
I saw function pagination_list_render($list):

...$html .= $list['start']['data'];...

but I don't know, how to add CSS classes here.

Can this be done in pagination.php template override?