Change the font color in a text widget

I am trying to change the color of the title fonts in my text widgets. I used Firebug to change the color in the CSS, but then realized there was a typo in the title. After I changed the typo, the font had changed back and is now crossed out (with a line through it) on the CSS in Firebug.

My website is It is the Chameleon theme by Elegant Themes.

Also, should I be creating a child theme before I change any CSS?