Modify Gmail CSS is a css extension for chrome. it's a free extension , it has 5 active users since released its first version, it earns an average rating of 0.00 from 0 rated user, last update is 1457 days ago.
This extension just change Gmail css to appear like Google Inbox.
You could download the latest version crx file or older version files and install it.
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You could find more help information from modify gmail css support page.
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More about manifest_file of modify gmail css.
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