Make navigation visible on mobile?

I've just switched to the Blog theme and like it quite a bit. Just one problem: The navigation bar isn't completely visible on mobile & my title (which, to be fair, is too long) partially hides the content. See here. Is there any quick CSS tweak to achieve something similar to how my old theme worked, putting the title on top & the navigation links in several rows below as needed? See here to see what I mean.