If a background image has been specified, the value of 'background-position' specifies its initial position.

With a value pair of '0% 0%', the upper left corner of the image is placed in the upper left corner of the box that surrounds the content of the element (i.e., not the box that surrounds the padding, border or margin). A value pair of '100% 100%' places the lower right corner of the image in the lower right corner of the element. With a value pair of '14% 84%', the point 14% across and 84% down the image is to be placed at the point 14% across and 84% down the element.

With a value pair of '2cm 2cm', the upper left corner of the image is placed 2cm to the right and 2cm below the upper left corner of the element.

If only one percentage or length value is given, it sets the horizontal position only, the vertical position will be 50%. If two values are given, the horizontal position comes first. Combinations of length and percentage values are allowed, e.g. '50% 2cm'. Negative positions are allowed.

One can also use keyword values to indicate the position of the background image. Keywords cannot be combined with percentage values, or length values. The possible combinations of keywords and their interpretations are as follows:

• 'top left' and 'left top' both mean the same as '0% 0%'.
• 'top', 'top center' and 'center top' mean the same as '50% 0%'.
• 'right top' and 'top right' mean the same as '100% 0%'.
• 'left', 'left center' and 'center left' mean the same as '0% 50%'.
• 'center' and 'center center' mean the same as '50% 50%'.
• 'right', 'right center' and 'center right' mean the same as '100% 50%'.
• 'bottom left' and 'left bottom' mean the same as '0% 100%'.
• 'bottom', 'bottom center' and 'center bottom' mean the same as '50% 100%'.
• 'bottom right' and 'right bottom' mean the same as '100% 100%'.

Examples:

      BODY { background: url(banner.jpeg) right top }    /* 100%   0% */
      BODY { background: url(banner.jpeg) top center }   /*  50%   0% */
      BODY { background: url(banner.jpeg) center }       /*  50%  50% */
      BODY { background: url(banner.jpeg) bottom }       /*  50% 100% */
      

If the background image is fixed with regard to the canvas (see the 'background-attachment' property above), the image is placed relative to the canvas instead of the element. E.g.:

      BODY { 
        background-image: url(logo.png);
        background-attachment: fixed;
        background-position: 100% 100%;
      } 
      

In the example above, the image is placed in the lower right corner of the canvas.