Hi @Jennifer_Blandos and welcome to the Community 
I’d like to mention that there is an option to change the font without a custom code. You can find it on the Appearance tab of your widget’s settings:
However, if you haven’t found the needed font in the list, you can use this solution - Change font for all elements (Event Calendar)
Check it out and let me know if it helped 
Regarding the color, which specific elements would you like to change the color of?