Increase size of slider head?

Hi Vlad, I just love Sydney it is a very good theme.
I wonder: Which class is the slider heading. I managed to make it float left but would also want the font-size to be REALLY big but it doesn’t seem to work:
See code below. The font-size isn’t affected but the rest works fine.
.text-slider .contain {
float: left;
text-align: left;
font-size: 500px;
text-transform: uppercase;
max-width: 600px;
margin: 0 auto;

Thanks /magnus

class for slider heading is .text-slider .maintitle
class for slider subtitlte is .text-slider .subtitle
class for slider button is .roll-button

Great, thanks a lot!