Woocommerce, not listening to my stylesheet!

Hi All,

I'm using woocommerce on my wordpress site and i'm trying to change the category size font from 2em to 1em, when I inspect element using chrome all the css is crossed out apart from (index):134

which has this code in it

.woocommerce ul.products li.product h3 {
padding: .5em 0;
margin: 0;
font-size: 2em;
vertical-align: middle;
text-align: center;
}

I've tried adding this code to practically every css sheet I can find and it still doesn't listen to me

.woocommerce ul.products li.product h3 {
padding: .5em 0;
margin: 0;
font-size: 1em;
vertical-align: middle;
text-align: center;
}

Can anyone help as to where I should be looking from this style to take precedence