Custom template - need a way of showing index in mobile view


Hello people! I changed the template of my blog aaaaages ago using a load of CSS - as a result it’s quite slow to load, but I’m at least quite happy with the way it looks when viewed on a desktop. I made the custom buttons down the right-hand side in order to navigate to the posts, which is quite important on a blog like mine (although they don’t work on a Mac and I have no idea why not). However my main issue is that when viewing on a mobile there’s no post index (as those buttons don’t show up) and I can’t find a way to insert one anywhere. Does anyone have any suggestions of what I can do about this?

Many thanks!

My blog is here: