Try must have screen off and lock app. Just swipe from the edge of the screen to lock your phone. Use awesome effects to power off!

Swipe Off allows you to power off your devices from the left and right edge. On phones with hardware buttons lock from the bottom edge is available. And even from the top edge (on Android < 8.0)!

Lock via notification and from the Lock Screen with one touch.

The touch area is transparent. Fingerprint unlock compatible!

Notes:

This app uses the Device Administrator permission.

The best way to remove an app is to use the appropriate button on the help page within the application. Thanks!