HALP! Change the color of one word in the titles of accordion block.

I have 4 accordions in my accordion block. I have a check mark as the first word in each of the titles. I'd like to change the colour of the check marks to yellow while the the rest of the text in the titles stays black.  Squarespace doesn't have a feature for this and site styles changes the colour for the entire title not just the one word. How can I achieve this? Thanks!

I think you already helped me with this. Thanks Tuan!