dialogs don't look right in webkit (sometimes)

[PalmerAL]

Starting in Chrome 42, the dialogs don't look right. They only show the header and the buttons, and everything else is hidden. If the max-height is removed from the dialog, it works fine.

[nt1m]

@PalmerAL It might just be chrome-dev being unstable. As workaround, I could use max-height: 80vh instead of 80%.

[PalmerAL]

This is also happening in safari for some dialogs, so its probably better to change it.

[PalmerAL]

However, changing to vh doesn't fix it. I'm not sure there's a good alternative solution for this.