@shakura this is a known issue with 7.3.3 where CSS override from within the dashboard is not working. https://docs.splunk.com/Documentation/Splunk/7.3.3/ReleaseNotes/Knownissues#Uncategorized_issues
You can either include the CSS as static stylesheet to your dashboard. https://docs.splunk.com/Documentation/Splunk/latest/AdvancedDev/UseCSS#Customize_styling_and_behavior_for_one_dashboard
Or add a <p/> element before the <style> element in the dashboard. Refer to the workaround in the Splunk Answers post: https://answers.splunk.com/answers/789487/why-doesnt-css-work-in-dashboards.html
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