Sticky add to cart plus and minus (for quantity) buttons need text color changed

[astrofinityligh]

when you scroll down to the bottom of the page, I have the "add to cart" button with a + and - to indicate the quantity you have added. Its in a box with a white background, and I want the text black. 

https://astrofinitylights.com/products/astronaut-galaxy-projector

Thanks in advance.

[Dan-From-Ryviu · Accepted solution]

You can try to add this CSS code to your theme.scss.liquid file 

.container-sticky_addtocart span.material-icons-outlined { color: #000 !important; }