I am a designer and have designed my own icons, I also found the code for the .svg icon but couldn’t see how to get it to change colour when hovered over. You have used this technique in a few places across your demos using the info boxes but for alot of people achieving what you show isn’t all that easy.
I have added my .svg icon into the info box section but cannot for the life of me figure out how you were able to add in the custom code and give the .svg an id which you are then targeting and giving a fill upon hover.