How do I change the font size of product titles on this website through WordPress?

Question

I am trying to change the font size of the product titles from 14px to 18px or higher. Not sure yet.

Here is how the code looks when I inspect it:

@media only screen and (min-width: 768px)
.woocommerce .product-title-link {
    font-size: 14px !important;

I would like to change the font size using custom css in WordPress.

In custom css, the code doesn't translate.

Here is the website: https://www.infinitybellatrend.com/shop/