Alternative Symbols for cellsuffix feedback

I am new to CL, so be patient…
I have started to create an activity that checks if factor pairs are truly a multiple of a pre-determined value (24 in my example) and that it adds to equal 11 (start of a quadratic factoring activity). The sample I used to start to create this gives a nice green checkmark as feedback in the appropriate cell when it is correct, but the otherwise is just empty " ". I could use just a text “X”, but I’d rather have a red “x” so it is a similar style to the green checkmark. How/where do I get symbols like the green checkmark to use as my otherwise feedback?

Here is the sample activity.

I’ve used this site to copy-paste.
Here’s one from the emoji section :x:. Just note that they don’t all necessarily display the same on different devices. I’ve noticed the nice green checkmark was just grey text on my students’ chromebooks on site.

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Thanks so much, Daniel. This worked perfectly. I’ll check it out with one of my students to see how it appears on their chromebooks.