UPDATE: i figure out how to do it :)
hi how do i change the font of product title in the product page? right now it's so huge.. this for example http://heartmycloset.me/collections/dress/products/olga
Liam here from Shopify - thank you for your question :)
Great to see you are looking to optimise your product pages so that the content is appearing exactly the way you would like. You can edit the font-size of the product title by editing the HTML of your theme, within the product.liquid file. If you would like to reduce the size of the product title you will find the code that controls this on line 50, see below:
In this case you would be looking to change h2 to h3 (or even h4) at both the beginning and end of the line of code above.
Hope this helps Cynthia, if you have any other questions or need clarification on the above points, just let me know!