A dark slate color theme for Rocket Chat.
Chrome: Download Here
Firefox: Download Here
When on a Rocket Chat site, click the plugin button in the top right corner of the browser.
Click the thee button menu to the right of the on/off button.
Click "Create New Style"
Enter a name and paste the contents of style.css into the code box.
Click the "Specify" button below the code box.
Select the "URLs starting with" option, and enter the URL of the rocket chat site, ie https://open.rocket.chat/
Click the "Save" button on the left side.
Close the tab and enjoy your new theme!