A dark theme for Visual Studio 2019.
Download and install the most current release build via the Visual Studio Marketplace: https://marketplace.visualstudio.com/items?itemName=MattDunleavy.GambleTheme
After installing, you can activate the theme within your Visual Studio IDE under Tools > Options > General.
Tested in Visual Studio 2019 Community Edition. Built on VSTheme Extension (Visual Studio Color Theme Designer)