.g280{
    float:left;
    width: 280px;
    margin: 20px;}
  .g480{
    float:left;
    width: 480px;
    margin: 0px;}
  .g600{
    float:left;
    width: 600px;
    margin: 20px;}
  .g320{
    float:left;
    width: 320px;
    margin: 0;}
  .grid .no-margin{
    margin:0;}
  .grid .no-left-margin{
    margin-left:0;}
  .grid .fr{
    margin-top:0;
    margin-right:0;}