which property or procedure allow the website fit to each monitor not regardless the resolution of the monitor and PC.

I did my web site where the size of the layout of all pages is at 1920 x 3000, but in computers with lower resolution that Full HD (1920 x 1080), the website is not auto - adjust to the low resolution and looks too big. I suppose that I need to turn

on some property to allow that the website is auto-adjusted to fit the resolution of each monitor and pc where the web site is open.

regards

Mario