Every user of various app on android phone always look for a dark theme in any app they want to use some phone maker like samsung has even gone a step further in making the entire feel of their phone to be in dark mode always. The good news is that in the latest update of chrome browser, you can now enable dark mode theme for the entire browser which will make your browsing experience even better.

The new dark mode is available in the latest stable version of Chrome (version 74.0.3729.112), so you don't need to mess around with experimental apps like Chrome Dev or Canary. However, the option to turn on Dark Mode isn't instantly available, and you have to enable it through Chrome flags.
You just need to enable a flag, then toggle a setting. But even though it's in stable Chrome, it's a beta feature, so there are some bugs that you might see as dealbreakers. Currently, the version of dark mode in Chrome stable only themes Chrome's interface, not websites, though this may change as the feature gets refined.
Enable Dark mode by following a few simple steps:

Update your Chrome to latest version 74+
Launch the app and paste chrome://flags in the address bar of Chrome
Tap the “Enable” box for Android Chrome UI dark mode. Also, enable Android web contents dark mode.
Relaunch Chrome.

After Chrome successfully relaunches, you'll still need to Enable Dark Mode for the app, so tap on the menu button in the upper-right corner of the screen and select "Settings." From there, tap on "Dark Mode," then enable the toggle on the following page to turn the feature on.

If the "Dark Mode" option isn't showing up within Chrome's settings, force close the app and check the settings again until "Dark Mode" appears. In our testing, we found that the option finally kicked in after force closing Chrome three or four times.

OR

> Copy and paste chrome://flags/#enable-android-night-mode in the address bar.

> Under "Android Chrome UI dark mode", tap on the drop down list and select "Enable". Then tap on Relaunch.

> Again, copy and paste this into your address bar, chrome://flags/#enable-android-web-contents-dark-mode

> Under "Android web contents dark mode", tap on the drop down list and select "Enable", then Relaunch. After that, select Default and Relaunch again.

> Then go to Settings on your Chrome browser > Dark mode and turn Dark mode on.

Source: https://www.naijatechspot.com.ng/2019/05/how-to-enable-dark-mode-on-android.html