1 #chart {

     2   width: 960px;

     3   height: 500px;

     4 }

     5 

     6 .black path {

     7   fill: none;

     8   stroke: #ccc;

     9   stroke-width: 3px;

    10 }

    11 

    12 .white path {

    13   fill: #fff;

    14   stroke: #fff;

    15 }

    16 

    17 .grey path {

    18   fill: #ccc;

    19   stroke: #666;

    20 }