Prevent bb-table border collapsing bug

[danneu]

Seems to only happen on windows.

Think it's caused by border-collapse: collapse;

https://jsfiddle.net/9yo3434f/ (default) vs https://jsfiddle.net/9yo3434f/1/ (collapse)

The solution I'll try is to change it to border-collapse: separate;.

Reported by Odin, so remember to confirm if solution works with him.