Cancel icons in pipeline dropdowns are misaligned
Summary
The cancel icons in pipeline dropdowns are off-center.
Steps to reproduce
What is the current bug behavior?
position: relative; top: ...; left: ...
![Screen_Shot_2017-12-18_at_11.57.13](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==)
What is the expected correct behavior?
margin: 4px
![Screen_Shot_2017-12-18_at_12.04.34](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==)