Hello @murugappan -
What you want to do is to customize the CSS files that determine the display themes. This is a very popular activity in this OpenSource EMR, and many others have asked the same question in this forum.
I ran a search here for ‘create theme’ and among the many returns these seemed to be the most relevant to your question. Other related searches may produce different, equally useful results.
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One particular tool to work with themes
Own Themes -
Long post with many related questions and answers:
User Interface Design Style Guide - The Beginnings -
Many ideas on modifying the CSS in different ways, not only the buttons
Hide and add buttons -
Long post with many ideas:
User Interface Renovations - #40 by system
Good luck with your project!
Best- Harley