How to add a margin at the left/right side of the text area?

Hello, list,

As the title. My eyes feel tired with too tight between the left side of
the xterm window and vim text area, it would be better if there can be a
margin between them.

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Regards,
Yue Wu

Key Laboratory of Modern Chinese Medicines
Department of Traditional Chinese Medicine
China Pharmaceutical University
No.24, Tongjia Xiang Street, Nanjing 210009, China

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