Changing the colour of a single word without it applying sitewide

Site URL: https://chinchilla-chicken-nanw.squarespace.com/

Using this code, I can change the color of specific words by making them bold

h1 strong {color:green; font-weight:normal!important}

However, this then implements the same change across the entire site when I would rather use this for specific words within certain blocks.

Is it possible?

Hi. You can change text to Markdown Block.

https://support.squarespace.com/hc/en-us/articles/206543587#toc-preformatted-code-blocks