Where is the CSS to change these things

The font for the prices is not looking good, I need to fix this

You can see the problem here – https://imgur.com/dGdJjLE

Many of our products have names that are too long for the popup to display and so the name gets cut off

You can see this problem here – https://imgur.com/5HgZifB

Can you help me to fix these two problems.

Thanks

Sean