I am using the [lightweight-charts] javascript library to generate some charts. For this example I am using the Realtime emulation chart.

In this example the background color is white. I would like to set the background color to black. I am following the documentation but I can't achieve the goal.

Following is the code I am using but it is not working:

var chart = LightweightCharts.createChart(document.getElementById('chart'), {
    width: 1200,
    height: 800,
    background: '#000000',
    textColor: '#ffffff'
});


var candleSeries = chart.addCandlestickSeries();
var data = [...]

What am I missing?