I suspect this is about the two sections with light blue background and dark blue text. Yup, it's hard to read. And then that weird clashing green Contact button is jarring when hovered over them. The rest seems fine.

Never been a fan of the yellow highlighter look at the top, but it at least doesn't make the page unreadable. But the only other place I ever see that is on sites trying to sell snake-oil products. On one line like that, maybe it's not that bad, but I could see search engines ignoring sites that have any of the snake-oil text effects.