Large leading whitespace

[ggvc-it]

Has anybody noticed there is a ton of leading whitespace near the top of the Slackin iFrame? I've seen this on my site and others as well. Seems like a bug to me. Most pronounced on mobile web, but it's there on desktop as well. Thoughts?

[parthp1808]

The css is the issue. (I saw in https://slackin-kfssjvywgq.now.sh/)
@media (max-width: 50rem) {
.splash {
margin-top:10rem
}
}
Here if you decrease the margin-top, it will fix it.