How Do You Build a Remote Company Culture?

If you don't see that someone's like down in the dumps and, you know, can't concentrate or whatever seems sad. If you don't get a handle on that, you can lose people pretty quickly. What tools do you use to try to mitigate that icebreakers, video or slack? And what's your kind of tech stack for communication and company culture building in a remote company? We're not currently using any like super specialized tools. But that's pretty much what we run the company off of.