Alfresco Media Management provides a black background (dark theme) for Share, that mutes elements until they are required, and makes it easier to work with rich media content. If you're a site administrator you can enable this theme.
For more information about using themes in general, see Share themes. Only an administrator can enable a theme.
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From the Content Services toolbar, select Admin Tools and click Application in the Tools list.
The Options page appears.
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Select Dark Theme from the menu.
The new theme now displays every time that you use Alfresco unless you choose to change it again.