JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://canvasjs.com/assets/script/canvasjs.min.js"></script>
<div id="chartContainer" style="height: 300px; width: 100%;border: 1px solid black;"></div>
<button href="#" id="button">
Button
</button>

CSS

#button{
  position: absolute;  
}

JavaScript

var chart = new CanvasJS.Chart("chartContainer", {    	
		data: [              
		{			
			type: "doughnut",
			dataPoints: [
				{ label: "apple",  y: 18  },
				{ label: "orange", y: 15  },
				{ label: "banana", y: 25  },
				{ label: "mango",  y: 30  },
				{ label: "grape",  y: 28  }
			]
		}
		]
	});
  
	chart.render();
  	
var button = document.getElementById("button");
button.style.top = (chart.bounds.y2 - chart.bounds.y1)/2 + "px";
button.style.left = (chart.bounds.x2 - chart.bounds.x1)/2 - 20 + "px";