.graph-grid {
  display: flex;
  position: relative;
  margin-top: 20px;
  flex-wrap: wrap;
}
.graph-grid > .graph {
  height: 320px;
  position: relative;
  /* Minimum width is 400px */
  flex: 1 1 400px;
  margin-bottom: 30px;
}
.graph-grid > .graph:not(:last-child) {
  margin-right: 10px;
}
.graph {
  position: relative;
}
:not(.graph-grid) > .graph {
  height: 320px;
  width: 100%;
  margin-top: 20px;
}
.graph > div:not(.chartjs-tooltip) {
  text-align: center;
  width: 100%;
  position: absolute;
  left: 0;
  top: 180px;
  z-index: 20;
  display: none;
}
.chartjs-tooltip {
  position: absolute;
  font-size: 14px;
  padding: 5px;
  border: 1px solid #000;
  border-radius: 6px;
  background: rgb(255, 255, 255);
  display: none;
}
.chartjs-tooltip > span:first-child {
  font-size: 16px;
  font-weight: bold;
  margin-bottom: 3px;
}