#viewer 
{
  position: relative;
  top: 0;
  left: 0;
  /* NOTE: the size and width should be set dynamically when initialized */
  width: 0;
  height: 0;
  /* Support IE touch screen */
  touch-action: none;
  -ms-touch-action: none;
}
#viewer .surface 
{
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0px;
  left: 0px;
  overflow: hidden;  /* VERIDIAN CUSTOMISATION */
  z-index: 50;
}