Hello,
First have a look on this tutorial to learn how to use the HikaShop override system,
here
.
You will have to add a specific class to your price without tax, go to your product/listing_price, and have a look on my screenshot :
You can see in the red bordered
2 new lines to frame your price without tax.
And for the css, to see how to add some custom Css to your frontend file css, have a look on
this tutorial
.
Then, you have to use the Inspector tool, for this point your element and
right-click =>
Inspector Tool (inspect etc etc...).
With the new window, you will be able to get your element class, to build your custom css code, and more especially the good selector, follow my scheme :
// All page in HikaShop :
.price_with_tax_class {font-size: 20px;}
.price_without_tax_class {font-size: 16px;}
// Only Product page :
.product_page_class .price_with_tax_class {font-size: 20px;}
.product_page_class .price_without_tax_class {font-size: 16px;}
// Only Listing page :
.listing_page_class .price_with_tax_class {font-size: 20px;}
.listing_page_class .price_without_tax_class {font-size: 16px;}
Hope this will help you to achieved what you need.
Regards