The blue is for links visited, it's the same colour as the blue on the dark theme. Hovering over links causes it to go blue too. It looks fine to me.
All button hovering is the same as the dark theme except the orange buttons on the sidebar turn a darker orange colour.
The text in the comment/post boxes is light grey when it says the "write your post content here" bit, but when you start typing the text is black.
I still have an issue with the upvotes on the frontpage being black. It makes it harder to see what you've already voted on. Strangely, they are a grey colour on subs and the upvote colours stand out more. I think there is an issue with two bits of css targetting the upvotes on the frontpage, but I can't figure out what's causing it.
Not sure how the blue (is that for links visited) on the main page will contrast to the white. If it looks fine to you, it's probably OK.
In the "submit a text post" field, you might try using a color other than grey? It looked iffy on the screenshot, but I can't be sure how it looks without actually witnessing it. Currently seems a bit light to be - maybe a darker grey.
Otherwise, no major issues.