Promoting OpenBSD on the Unix & Linux Stack Exchange site

Hi,

I'm quite active on the Unix & Linux Stack Exchange site
(https://unix.stackexchange.com/). They are currently asking for
"Community Promotion Ads"
(https://unix.meta.stackexchange.com/questions/4765/community-promotion-ads-2018)
and since I'm fairly fond of OpenBSD I thought I'd add an OpenBSD ad
there. These ads will show up in the sidebar of the main U&L site.

However, I thought I'd ask here before I do, just to be sure I'm not
doing anything stupid or legally wrong. If ok, I wonder if there's a
verison-agnostic image that I could use (like the one on the OpenBSD
Wikipedia page maybe?).

I do not personally gain in any way from doing this.

Regards,

--
Andreas Kusalananda Kähäri,
National Bioinformatics Infrastructure Sweden (NBIS),
Uppsala University, Sweden.