Allow options to customize the chart area with a variety of settings such as background color, border, opacity and background image in the pivot chart.
For example, to change the of the pivot chart’s background, set the property
opacity to 0.5.
Allows to set the background of the chart area that accepts value in hex and rgba as a valid CSS color string.
Defaults to ‘transparent’
Allows options to customize the border of the chart area.
Allows to set the opacity for background.
Defaults to 1