[chores] Added CSS for inline-link-container

[pandafy]

Changes

#Please explain changes made in your PR#

Screenshots

#For UI changes, please share a screenshot#

Checklist

• I have read the contributing guidelines.
• I have manually tested the proposed changes.
• I have written new test cases to avoid regressions. (if necessary)
• I have updated the documentation. (e.g. README.rst)
• I have added [change!] to commit title to indicate a backward incompatible change. (if required)
• I have checked the links added / modified in the documentation.

#Closes #(issue-number)#

[coveralls]

coverage: 98.395%. remained the same
when pulling 5c59223 on add-admin-inline-ctb-css
into 81d8e7a on master.