Arrow w/ top center attachment and positioning renders underneath content

[nmschulte-aviture]

nmschulte:~$ chromium --version
Chromium 53.0.2785.143 built on Debian stretch/sid, running on Debian stretch/sid

This example is using top center attachment and positioning. Making the pseudo-element used to apply this visual z-index: 1 seems to fix the issue for me. As well, changing the pseudo-element from ::before to ::after, for .drop-element.drop-element-attached-bottom.drop-element-attached-center .drop-content:before (and .drop-element .drop-content:before... which may be a problem) also makes the visual appear correctly.