Wen Business Pro theme next icon button in posts

Dear Catch themes, I'm certainly loving the new Wen Business Theme and the customisation of the colours is brilliant but I seem to have run out of options to change the next buttons at the bottom of the posts. I'd like to have a white back ground but can not seem to find where to make the change. My website example is http://103.37.9.101/~buttercu/ Might you please help with some code. Thanks Jen