You need to change the hex color of "background-color". There should be annotations in the coding to help :0

There are 5 shapes per stat option. If you want one of the shapes to be white, the code should be "background-color: #ffffff;" If you want it to be grey, change it to "background-color: #5d5d5d;"

If you can find it in the code, press Ctrl + F and type in "background-color: #ffffff" it will show you where it is!