Images can be super tall

[curtisgibby]

Since my screen is very wide, the default GitHub CSS can make images become very wide and therefore very tall. I find myself having to scroll to see the entirety of a screenshot from modern phones. The following CSS snippet appears to work for my use-case.

.markdown-body img {
    max-height: 60em; /* or ~800px */
}

Before

After

If you'd like, I can open a PR with this minor change.

[mdo]

I think I'll pass on this for now and see what others say.