custom css for 1 post type

Hi everybody,

I’m using Block Magazine as a theme at the moment.
It has .item_inn.tranz.
I would like to hide this in one particular post type (link)
How do I do this?
I’m a php noob don’t make it too hard please :p ??

.post-format-link .item_inn.tranz{display:none} doesn't work..

Thanks!