@import url("https://code.highcharts.com/css/highcharts.css");

#container {
    height: 400px;
    max-width: 800px;
    margin: 0 auto;
}

.highcharts-tooltip-box {
    fill: black;
    fill-opacity: 0.6;
    stroke-width: 0;
}

.highcharts-tooltip text {
    fill: white;
    text-shadow: 0 0 3px black;
}
