trying to target a h4

I have a plugin that creates tables for me visually. I'm trying to target some <H4> tags to change their color but I"m not having any luck.

The table has a class of custom-link-color but I'm not having any luck getting it to update.

I was trying this: .custom-link-color h4{color:red;}

my page: http://dev.thetruckprogram.com/pricing-and-availability/

thanks,