i believe this is not possible.
you may download the jar file of the plugin to you local machine, extract it and modify "style/wallboad.css"
then you need to make a jarfile of it again and upload to you jira..
but i am not sure if this will work
You can change it at Administration > System > User Interface > Look an Feel
For more information, you can refer to this documentation : https://confluence.atlassian.com/display/JIRA/Customising+the+Look+and+Feel
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