File: public/assets/local/css/highcharts.min.css

.animated.highcharts-area-series,
.animated.highcharts-areaspline-series,
.animated.highcharts-line-series,
.animated.highcharts-spline-series {
  fill: none;
  stroke-width: 2px;
  stroke-dasharray: 5px;
  animation: dashoffset 1s linear infinite;
}
@-webkit-keyframes dashoffset {
  0% {
    stroke-dashoffset: 0;
  }
  100% {
    stroke-dashoffset: -20px;
  }
}
@-moz-keyframes dashoffset {
  0% {
    stroke-dashoffset: 0;
  }
  100% {
    stroke-dashoffset: -20px;
  }
}
@-ms-keyframes dashoffset {
  0% {
    stroke-dashoffset: 0;
  }
  100% {
    stroke-dashoffset: -20px;
  }
}
@keyframes dashoffset {
  0% {
    stroke-dashoffset: 0;
  }
  100% {
    stroke-dashoffset: -20px;
  }
}