Background image size, Android

Question

We have a problem with 2 projects already:

A big background image (to fill a big screen of a desktop PC) is displayed very small in the upper left corner of the smartphone display.

This is one of the used codes:

background: #7F7F7F url("../images/hg4.jpg") repeat left top scroll;

Perhaps there is a simple solution for all devices, or a detection and 2 versions are necessary?

Answer 1

I didn't test it but you can try background-size: cover; background-position: center center; background-attachement: fixed;