background size css move code example

Example 1: css background image cover

html { 
  background: url(images/bg.jpg) no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

Example 2: css image background center horizontally in div

/*
div with 
class="slot_image" 
*/
.slot_image{
    background: url(url) no-repeat center;
}