Google Chrome 74 offers a built-in dark mode on Windows. Instead of having its own dark mode, Chrome simply switches Windows 10's overall app mode. This is how it works normally, but there is a way to force it as well.
How to Enable Chrome Dark Mode
You can easily enable Google Chrome's built-in dark mode by going to Settings> Custom> Colors and selecting "Dark" under "Choose your default app mode." Windows 10 gets dark and Chrome, along with some other applications, follows this overall setting.
On a Mac, you can enable macOS dark mode to achieve the same thing.
Currently, it only works for some people. From the Chrome 74 release on April 23, 2019, Google tests this feature with "a small number of Chrome M74 users" and "it becomes more accessible in the near future," according to a Chrome community manager. To enable it now, you can start Chrome with the
- force-dark mode option.
How to force dark mode
Chrome has a built-in option that allows dark mode. This works right now, even though the normal system-wide dark mode doesn't work. It will also force Chrome to dark mode, even if Windows 10 default app mode is set to "light."
To enable this option, find the shortcut you normally use to launch Chrome. For example, it may be on your taskbar or desktop. We use the shortcut bar on the taskbar.
Right-click the shortcut and select "Properties". For a shortcut on the Chrome taskbar, right-click the taskbar icon, right-click "Google Chrome" and select "Properties." 
Add a space followed by
- Force-Dark mode to the end of the Target field. In our system, the Target box looks like this:
"C: Application files (x86) Google Chrome Applications chrome.exe" --force-dark-mode
It may be
Click to "OK" to save your changes.
 Click "OK" and use the shortcut to launch Chrome. If you already have Chrome open, you must close Chrome before restarting it. To do so, click on the menu> Exit. Wait a moment for Chrome to completely shut down and launch Chrome with the shortcut you've modified.
You will see the new dark mode, which unfortunately looks much like Incognito Mode.
How to make Chrome's title bar Colorful (or not)
If you don't want to Chrome's title bar is colorful or wants it colorful for Settings> Custom> Color Interface and select the "Title Bars and Window Borders" option under "Show Accent Color on the Following Areas."
If this option is enabled, the Chrome title bar will use the accent color you set in the Colors box here.
RELATED: How to get Colored Window Title Bars on Windows 10 (instead of white)
How to Enable Dark Mode with a Theme
If you do not want to touch any of this – or if you are using an older version of Windows like Windows 7, you can always install a dark fashion theme for Chrome. Google now offers an official theme collection for Chrome. Just go to the Chrome Web Store and install Chrome's "Just Black" theme.
This is darker than Chrome's built-in dark mode on Windows, so you might even prefer it if you're looking for a darker browser. Chrome Web Store has other themes you can install too.