You can simply add the following code linking to your css to the announcement banner to make it work :)
for more you can refer link below:
We had multiple serious bugs with Jira related to the presence of the announcement banner (not related to the content itself of the banner). It seems that the QA team at atlassian is not testing them and expect to have to disable it in order to allow people to use jira properly. Usually these were related to GH.
So, I would be happy to find another place were we can inject out custom CSS.
Any changes you make in the JIRA install folder will be lost when you next upgrade.
The proper way to do this is to write a simple JIRA plugin that includes the CSS as a web-resource.
<web-resource name="Resources" key="resources"> <resource name="foo.css" type="download" location="resources/foo.css"/> <context>atl.admin</context> <context>atl.general</context> </web-resource>
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