HIGHEND Theme problem 2

I have some problem with my website using highend theme & need to fix .
in product pages , when adding discount to products price , the old price & product name are over written & then should choose smaller font to solve the problem & it’s too small .Also don’t know how change product name font .

I can see that there is 2 outdated template in status page :
HighendWP/woocommerce/cart/cart.php version 3.3.0 is out of date. The core version is 3.4.0,
&
HighendWP/woocommerce/single-product/add-to-cart/variable.php version 3.0.0 is out of date. The core version is 3.4.1,

Also style.css have 8 error & this error message exist in editor page for style.css
There are 8 errors which must be fixed before you can update this file.

I need help to fix these problems
my website url is sigmadigitals.com