Kindly make whenever you post a question :
- Define a meaningful title
- Describe the problem; if required attach screenshot/oml
This practice helps folks here to address the question.
Coming to the question you post;
- Goto the layout used for the Screen
- Now on the LayoutWB you can define the styling as required [If needed globally]
else
- For that particular screen override the CSS on the local Screen.
Good Luck!