UI Updates

Closes #148 

Huge mess of (mostly small) UI updates that were noticed by either Rachel or me after the deployment happened. I tried to make decent commit messages so that you can see exactly what changed. Also makes the scrolling recently added tiles on the front page actually scroll. Yay! 

I think this is all I'm going to do on this branch for now. Cate, after you merge it could you also deploy it so that I can show Rachel? Thanks a bunch!