.chart-block{
  height: 400px;
}
.chart-container {
    direction: ltr;
    height: 350px;
    position: relative; /* for overlays */
}

.chart-container.loading {
    background: transparent url(images/loading.gif) no-repeat center center;
}
.chart-container.loading::after {
  content: "Loading chart...";
  display: block;
  text-align: center;
  color: #777;
}

.chart-container.error {
    background: transparent url(images/error.png) no-repeat center center;
  border: 1px solid #d33;
  padding: 10px;
  color: #b00;
}