How do I change the partition tab hover colour please?

Hi,
​
How can I change the partition tab hover colour please? I'm not sure how to call it in my SCSS (same as CSS).
​
I might as well also ask, in case anyone wants to look at this, how do I change the tab background colour too please?
​
Thanks :-)

.ui.tabular.menu .item:hover { background: colour; }