html use background image that fit screen code example
Example 1: html background image fit to screen
body {
background-position: center;
background-repeat: no-repeat;
background-size: contain;
}
Example 2: css background full width
body {
background: url(img/bg-image.jpg) no-repeat center center fixed;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}