#tooltip {
        color: white;
        opacity: .9;
        background: #333;
        padding: 5px;
        border: 1px solid lightgrey;
        border-radius: 5px;
        position: absolute;
        z-index: 1880;
        visibility: hidden;
        white-space: normal ;
        pointer-events: none;
      }
      #tooltip1 {
        color: white;
        opacity: .9;
        background: #333;
        padding: 5px;
        border: 1px solid lightgrey;
        border-radius: 5px;
        position: absolute;
        z-index: 1880;/* 10 */
        visibility: hidden;
        white-space: normal;/*nowrap*/
        pointer-events: none;
      }
      
      #circle circle {
        fill: none;
        pointer-events: all;
      }
      path.group {
        fill-opacity: .8;
      }
      path.chord {
        fill-opacity: .8;
        stroke: #000;
        stroke-width: .25px;
      }
      #circle:hover path.fade {
        display: none;
      }