<div class="ui vertical buttons">
<button class="ui button">Button</button>
Top of the button was not rounded
sets border-radius when vertical buttons have a single child button
Thanks a lot for filing this issue, and including an easy to understand test case. I've added a milestone, and will try to take a look as soon as I can.
#4107 Fixes only one vertical button
I've implemented this with slightly more succinct code.