background size and position in css code example

Example 1: 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;
}

Example 2: background image height and width

.class{
	background: url("../images/icons/map.png") no-repeat center center/50px 50px fixed;
}