A029G13

CSS3 allows you to control the background size on your web page.

In order to cover the entire web page, you will use the background-size property and set it to cover.

In addition to the cover property, there are other settngs. You can get additional info here: w3schools.com

Guide:

html
{
background: url(images/background.jpg);
background-repeat:no-repeat;
background-position: center center;
background-attachment: fixed;
background-size: cover;
}