div.google-visualization-tooltip {
  width: auto;
  background-color: rgba(0,0,0,0.7) !important;
  box-shadow: none !important;
  border: none !important;
  text-align: right;
}


div.google-visualization-tooltip>ul>li> span {
  font-size: 15pt !important; 
  font-family: Aria !importantl;
  color: white !important;
}