how can I put a background in a web pege

Answer 1

In the CSS:

.class {
background-image: url(url_here);
}

Answer 2

any one to answer¿

Answer 3

in css file
body{
background-image: url("url" ) ;
background-repeat: no-repeat;

}
in html file

<link rel="stylesheet" href="name of file.css">