Simple Question: How to change colors of H1 on diff pages?

Site URL: https://www.xianfoods.com/shop/box-of-10-xff-chili-oil-packs

Hi,

I'm just trying to achieve something simple: how do I change the "CARE PACKAGE OF 10 XFF CHILI OIL PACKS" (which is white right now, and not very visible) to black? I tried injecting the following into the Products Settings->Advanced-> page header code injection for this product, but nothing happens:

<style>
h1#yui_3_17_2_1_1587420612063_349 .product-title {color: #000000;}
</style>

Thank you

#yui is dynamic ID. 

Use #block-yui

Use this tool to find block yui id. https://chrome.google.com/webstore/detail/squarespace-collectionblo/bggpdfnccodbnmcndckmeehdjkjojkde