This example has custom CSS added:
#testchart { background-image: url(“https://b2i.cloudaccess.host/wp-content/uploads/2021/03/BlueBG.jpg”); }
#testchart .amChartsLegend.amcharts-legend-div{display:none;}

Shortcode Breakdown
Shortcode break down All of these settings and more can be found in Settings / B2i Options
b2i_chart Module
s="EAT" Symbol for data display
c="d1d1ff" Hex color code for Data line
fa="0" Fill Alpha set to 0 to not have any fill for the chart area
lc2="ffffff" Label Hex color set to ffffff (white)
bga="0" Chart Background alpha set to 0 to hide
ssb="0" Show Scroll Bar set to 0 to hide
ca="0" Cursor Alpha set to 0 to hide
vct="line" Volume Chart Type set to line
vfa=".1" Volume Fill Alpha set to .1 for be slightly visible
cba="0" Chart Border Alpha set to 0 to hide
udg="1" Use Data Grid – instead of solid lines
ga="0" Setting for next plugin release to set Grid Alpha to 0 and hide

JavaScript API Breakdown
oChart.BizID= “449”;
oChart.Symbol = “EAT”;
oChart.Period= “3”;
oChart.FillColor = “d1d1ff”;
oChart.FillAlpha=”0″;
oChart.InsideLabelAlpha=0;
oChart.AxisLabelColor=”ffffff”;
oChart.BGAlpha=0;
oChart.ShowScrollBar=false;
oChart.CursorAlpha=”0″;
oChart.VolumeChartType=”line”;
oChart.VolumeFillAlpha=.1;
oChart.ChartBorderAlpha=”0″;
//oChart.UseDashGrid=”1″; not needed with following setting to set Grid Alpha off
oChart.GridAlpha=”0″;
GetChart();

[b2i_chart sdiv="testchart" s="EAT" c="d1d1ff" fa="0" lc2="ffffff" bga="0" ssb="0" ca="0" vct="line" vfa=".1" cba="0" udg="1" ga="0"]