Label text are not vertically aligned

Summary

Label text are not vertically aligned in div. System font may be the reason of it. (Summarize the bug encountered concisely)

Steps to reproduce

1. Browse GitLab.com in Windows or Linux machine
2. Check the label and you can see it

Expected behavior

The text should be vertically aligned in label container

Actual behavior

It is not aligned vertically in it's container

Screenshot

Possible fixes

may be need to set line-height explicitly