This is the best solution I have found:
https://coderwall.com/p/jg4kog
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Inside of Sublime Text go to Preferences > Browse packages
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Navigate to the User folder.
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There you create a file called Default.sublime-theme
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Open that file in Sublime Text and copy and paste the following JSON
object:
.
[
{"class": "tab_control", "attributes": ["selected", "file_medium_dark"],"tint_modifier":[255, 255, 255, 80]}
]