Structural and Grammatical errors.

[RealWorldEdits376W]

The second line of the introductory paragraph is written as, "It's really easy to customize and usage. You can use for from 320px to large resolution pixels of new generation screens and mobile devices. (Fully Responsive Material Design)."
This line contains some grammatical and structural errors.

The correct line could be : It's really easy to customize and use. You can use from 320px to larger resolution pixels on new generation screens and mobile devices. (Fully Responsive Material Design)

Thank you.