@mjawa,
You can set border property to the chart container to show a border around it as shown below:
<div id="chartContainer" style="height: 360px; width: 100%; border: 2px solid black;"></div>
Or you can take a look at this jsfiddle.
If this doesn’t suit your requirements, can you please provide us some pictorial representation so that we can understand your requirements and help you out.
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Suyash Singh
Team CanvasJS