/**
 * Grid
 */
#grid{

    /* Vertical grid lines */
    background: url(http://dev.christophzillgens.com/css/img/bg-grid-12-980.gif) repeat-y 0 0;

    /* Dimensions - same width as your grid with gutters */
    width: 980px;

    /* Grid (left-aligned)
    position: absolute;
    top: 0;
    left: 0;
    */

    /* Grid (centered) */
    position: absolute;
    top: 0;
    left: 50%;
    margin-left: -490px;

}

/**
 * Classes for multiple grids
 *
 * When using more than one grid, remember to set the numberOfGrids 
 * option in the hashgrid.js file.
 */
#grid.grid-1 {

    /* Vertical grid lines for grid 1 */
    background: url(http://dev.christophzillgens.com/css/img/bg-grid-12-980.gif) repeat-y 0 0;

}
#grid.grid-2 {

    /* Vertical grid lines for grid 2 */
    background: url(http://dev.christophzillgens.com/css/img/bg-grid-660.gif) repeat-y 160px 0;

    /* Adjustments */
    padding: 0 160px;
    width: 660px;

}

/**
 * Horizontal grid lines, defined by your base line height
 *
 * Remember, the CSS properties that define the box model:
 * visible height = height + borders + margins + padding
 */
#grid div.horiz {

    /* 20px line height */
    height: 20px;
    border-bottom: 1px dotted #aaa;
    margin: 0;
    padding: 0;

}