Tidy up CSS and consolidate classes #29
Description
This isn't a fun one, but I think to make our code more presentable (especially if we want to use this in portfolios), we need to make the code cleaner
A lot of the CSS is repeated, especially as everyone made their own sidebars/overlays. A lot of the designs are repeated, especially for things like inputs/buttons/etc, but everyone has made theirs slightly different. This was actually the intention of the original "reusable CSS classes" issue, but I think the purpose of that task was misunderstood.
Your goal is to go through the styles.css file and tidy this up. Consolidate classes into single reusable classes where possible. You will then need to go into the HTML files and apply these classes where necessary.