no, it didnt work

Hello, it didnt work.I have the refresh theme and I need to make the font on the product description larger.  Any idea how this could be done?  Thanks! 

I need help changing the product description to a larger font.   Please help, thanks!

I need help changing the product description to a larger font.  Please help, thanks!

I need help changing the product description to a larger font.  I saw the past solutions and when I pasted them on layout.theme.liquid, only the spacing increased, not the actual font.  Please help, thanks!