Font to resizing in roots theme

Hi, using roots theme but the font is not resizing. Can you help me somebody why ?
http://projects.qbf.ie/tvconcepts/
THIS SECTION:

Available in 3 different sizes
or connect them together to make and even bigger hose
25ft (Approx 7.5 mts) €22.99 BUY NOW!
50ft (Approx 12.2 mts) €44.99 BUY NOW!
100ft (Approx 30.5 mts) €54.99 BUY NOW!

This isn’t the place to ask for CSS help