svg.vtree {
  overflow: hidden;
  background: #ffffff;
  -webkit-box-shadow: 4px 4px 8px rgba(0,0,0,0.5);
  -moz-box-shadow   : 4px 4px 8px rgba(0,0,0,0.5);
  box-shadow        : 4px 4px 8px rgba(0,0,0,0.5);
}