Colour issues

First of all, love the theme! Sadly I’ve run into some minor issues that end up messing up the website.

Most importantly, the standard colours for links/clickable things seem to be white and orange, with no way to change that. If a website picks white as a background colour for a page (https://kameraadschappij.nl/ons-fundament/), this makes links nearly invisible until a user hovers the link, when it turns orange. Is there a way to change this?

Secondly, when a white background for a page is picked, there is a black bar under the page header that doesn’t seem to go away.

Thirdly, when editing the ‘index’ theme template, it doesn’t seem to actually affect the blog page, which I believe it is supposed to do.

Again, I love the theme but these are some issues I’ve run into! Please let me know if there is a way to fix them that I have missed, many thanks in advance.

The page I need help with: [log in to see the link]