Archives & css problem

Hey. Could someone be so kind as to help me with this problem I’m having. I have an archive page on my website but the css is not taking effect on it. I don’t get why it’s doing this but have a hint it’s to do with the css of this theme.

I’m using ul codes for my archives.

Here is the link to my stylesheet.

Can someone please help me because I cannot figure this out and it’s driving me bonkers. Thank you!