The h3 element has a class of "title" applied to it so make sure you have added the class correctly.
Then check through your stylesheet for any "global rules" that you may have set for the h3. That will be any rules in the stylesheet where you have said something like:
That is a global rule that will affect all h3s in the page.
After you have found all the rules that are applied to the h3 you can then cancel them out in the .title class.
It is better not to set global rules for anything other than the basics (margin,padding,font etc.) otherwise you have to cancel them all out if you want something different. It all depends on the job in hand though and if you are sure an element is never to be used anywhere else you can define it globally.
You could of course change the h3 in my example to another perhaps more suitable element for your structure as css doesn't care what an element looks like (most of the time) and you could change it to an h4 instead or whatever fits in with the logic and structure of the page.