for example dark facebook, Youtube

Create new style ? You can find style creation tutorial here.

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Marco Costa

User site: https://userstyles.org/users/293107

User Styles

Google Inbox Dark Theme (June 2015)

Installs:

Created: Jun 08, 2015

Last Updated: Jun 25, 2015
Gitter Dark Teal

Installs:

Created: Jun 14, 2015

Last Updated: Jun 14, 2015
Bomb Manual v1 - Keep Talking and Nobody Explodes

Installs:

Created: Sep 14, 2016

Last Updated: Sep 14, 2016
Dark Wealthsimple

Installs:

Created: Jun 02, 2016

Last Updated: Aug 19, 2016

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