XF 1.4 Center "discussions" and "messages" on the index page

[Betclever]

Hello all,

I'm looking to vertical center this.
Can someone tell me which CSS command I have to use to do this and the class cause I did not find a way to do it by myself. :/

You will see Discussions and messages almost on the top of the category so I just want to vertically center this.

Thanks.