How to make full screen background in a web page

Question

How to make an image as background for web page, regardless of the screen size displaying this web page? I want to display it properly. How?

Answer 1

Use this CSS to make full screen backgound in a web page.

body {
    margin:0;
    padding:0;
    background:url("https://static.vecteezy.com/system/resources/previews/000/106/719/original/vector-abstract-blue-wave-background.jpg") no-repeat center center fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}