.link {
    stroke-opacity: 0.6;
    pointer-events: all;
      }
  
    .node circle {
        pointer-events: all;
      stroke: #fff;
      stroke-width: 1.5px;
    }
    
    
      div.tooltip {
      position: absolute;
      background-color: white;
      max-width: 200px;
      height: auto;
      padding: 1px;
      border-style: solid;
      border-radius: 4px;
      border-width: 1px;
      box-shadow: 3px 3px 10px rgba(0, 0, 0, .5);
      pointer-events: none;
    }