Adding a CSS Class to a Block

Hey guys,

Really like the new look of the website!

Anyway...

I'm trying to remove the margin from the list block in specific areas.

This is what the CSS looks like:

ol, ul {
    margin: 0 0 1.5em 3em;
}

I've added a CSS class to target the areas I need to remove the margin and added following custom CSS:

.product-box ol, ul {
margin: 0 0 0em 0em;
}

But noting happens.

What am I don wrong?

Thanks