My site title isn’t working on mobiles

Hello everyone!

I am currently helping my mom set up a website and I am almost finished. The big problem I am encountering is that the title and the sub-title (not sure what the word for it in english is) is not adapting properly when used on a mobile phone. I’ve tried adding extra CSS but I think the title is too long and even when I managed to make the font turn smaller on phones, it is still too long of a word and I don’t know how to change it. Also the sub-title explaining what the page is about disappears when resized to fit phones.

I’m sorry for my ignorance on these subjects but I really need to fix this and I would love any help I could get.

Thanks!

The page I need help with: [log in to see the link]