How to make text static ?

Theme : twenty eleven child theme

Hi,

i try to explain it with my best English 🙂

I have texts on home pahe with backgrounds… when i resize the page with my mouse manually, the backgrounds are reduced progressively, but the texts remain the same size, so they flow out from the background. How can i change the texts so that they become smaller and smaller with the page size, just like the backgrounds ?

See on this page : http://webdesign.igorlaszlo.com

Thanks in advance !