How to have a search bar as rapidtables.com

How to have a search bar like rapidtables.com?

prodon said:

How to have a search bar like rapidtables.com?

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I don not understande

looks like a google search bar, but I don't remember how you got it. I used one like this 10 years ago, but I don't remember if it's provided by Adsense or by other google means, but it's definitely something from google...

This is set by Google, it is not achieved by any process. If your site has a certain authority, has a reasonable index number and the searched word is directly related to your site (a search result such as sitename, sitename.com) and you have not used a tag such as <meta name="google" content="nositelinkssearchbox"> in your meta tags, your site The search box will appear in the focused search result.