XF 1.4 Alert Menu Hover?

Hi! what I am looking for is to change the colour of the hover when I am looking through my alerts. I have an uploaded image as an example, in it an arrow pointed to the hover colour (I'm trying to change the red).

i've looked through my templates and such and couldn't find the right .css to change this, so if anyone knows which one/where it is, it would be helpful!

Thanks in advance :)