How to take screenshot on vivo X21i

Brand: 
vivo
Model: 
X21i
Instructions: 

One of the easiest things in the world.
To make a screenshot on the vivo X21i just have to:
1. Go to the screen or image you want to capture on your phone.
2. Simultaneously press the power button and volume down.

This screenshot is saved to your gallery in the "Screenshot" folder or "Screenshots"