How to Find Block ID for Custom CSS?

I am struggling to find the block ID for the banner image on this page: https://woodslifecoaching.com/about as I would like to add some custom CSS to edit the H1 text colors on this page only.

So far I am only getting the YUI code which I believe is not safe to use...

Any ideas?

@lindi Try this extension: https://chrome.google.com/webstore/detail/squarespace-collectionblo/bggpdfnccodbnmcndckmeehdjkjojkde

or my guide: https://beaverhero.com/squarespace-how-to/#How_to_find_Block_ID

or

div#block-yui_3_17_2_1_1571791886764_5472 h1 {
    color: red;
}

Yes, #yui will change if you reload website

Dont use #yui, please use #block- or #block-yui or #page, or...