{% load colors %}

#my_div {
    /* non-css3 */
    background: #{{ color }};
    /* IE */
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#{{ color }}', endColorstr='#{{ color|lightness:"30" }}'); 
    /* webkit */
    background: -webkit-gradient(radial, left top, left bottom, from(#{{ color }}), to(#{{ color|lightness:"30" }}));
    /* firefox 3.6+ */
    background: -moz-linear-gradient(top,  #{{ color }},  #{{ color|lightness:"30" }});
}