I use in my landing page some links in text blocks that link to anchors. 

However, in my case the font color for a visited link renders unfortunately to the background color which makes the text unreadable.

Wysiwyg editor just allows me to change the color of the text at all, but not for visited links (which could be a particular word in a text). How can I adjust the color for visited links (i don't need the behaviour that visited links have a different color).