/* Responsive Full Background Image Using CSS
 * Tutorial URL: http://sixrevisions.com/css/responsive-background-image/
*/
body {
  /* Location of the image */
  background-image: url(file:///C|/Users/Winy/Downloads/responsive-full-background-image-master/responsive-full-background-image-master/images/background-photo.jpg);
  
  /* Image is centered vertically and horizontally at all times */
  background-position: center center;
  
  /* Image doesn't repeat */
  background-repeat: no-repeat;
  
  /* Makes the image fixed in the viewport so that it doesn't move when 
     the content height is greater than the image height */
  background-attachment: fixed;
  
  /* This is what makes the background image rescale based on its container's size */
  background-size: cover;
  
  /* Pick a solid background color that will be displayed while the background image is loading */
  background-color:#464646;
  
  /* SHORTHAND CSS NOTATION
   * background: url(background-photo.jpg) center center cover no-repeat fixed;
   */
}

/* For mobile devices */
@media only screen and (max-width: 767px) {
  body {
    /* The file size of this background image is 93% smaller
     * to improve page load speed on mobile internet connections */
    background-image: url(images/background-photo-mobile-devices.jpg);
  }
	}







-----------------------------
.boxgroesse {
    width: 250px;
    height: 175px;
}
 
#box1 {
    background-color: red;
    position: absolute;
    top: 90px;
    left: 100px;
}
 
#box2 {
    background-color: green;
    position: absolute;
    top: 70px;
    left: 300px;
}
 
#box3 {
    background-color: blue;
    position: absolute;
    top: 210px;
    left: 200px;
}