JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.bundle.min.js"></script>
<script>
  window.chartColors = {
    red: 'rgb(255, 99, 132)',
    orange: 'rgb(255, 159, 64)',
    yellow: 'rgb(255, 205, 86)',
    green: 'rgb(75, 192, 192)',
    blue: 'rgb(54, 162, 235)',
    purple: 'rgb(153, 102, 255)',
    grey: 'rgb(231,233,237)'
  };

  window.randomScalingFactor = function() {
    return (Math.random() > 0.5 ? 1.0 : -1.0) * Math.round(Math.random() * 100);
  }

</script>
<div id="canvas-holder1" style="width:75%;height:200px;">
		<canvas id="chart"/>
	</div>

CSS

canvas{
			-moz-user-select: none;
			-webkit-user-select: none;
			-ms-user-select: none;
		}
		#chartjs-tooltip {
			opacity: 1;
			position: absolute;
			background: rgba(0, 0, 0, .7);
			color: white;
			border-radius: 3px;
			-webkit-transition: all .1s ease;
			transition: all .1s ease;
			pointer-events: none;
			-webkit-transform: translate(-50%, 0);
			transform: translate(-50%, 0);
		}

		.chartjs-tooltip-key {
			display: inline-block;
			width: 10px;
			height: 10px;
			margin-right: 10px;
      border-radius: 5px;
		}

JavaScript

Chart.defaults.global.pointHitDetectionRadius = 1;

		var customTooltips = function(tooltip) {
			// Tooltip Element
			var tooltipEl = document.getElementById('chartjs-tooltip');

			if (!tooltipEl) {
				tooltipEl = document.createElement('div');
				tooltipEl.id = 'chartjs-tooltip';
				tooltipEl.innerHTML = "<table></table>"
				document.body.appendChild(tooltipEl);
			}

			// Hide if no tooltip
			if (tooltip.opacity === 0) {
				tooltipEl.style.opacity = 0;
				return;
			}

			// Set caret Position
			tooltipEl.classList.remove('above', 'below', 'no-transform');
			if (tooltip.yAlign) {
				tooltipEl.classList.add(tooltip.yAlign);
			} else {
				tooltipEl.classList.add('no-transform');
			}

			function getBody(bodyItem) {
				return bodyItem.lines;
			}

			// Set Text
			if (tooltip.body) {
				var titleLines = tooltip.title || [];
				var bodyLines = tooltip.body.map(getBody);

				var innerHtml = '<thead>';

				titleLines.forEach(function(title) {
					innerHtml += '<tr><th>' + title + '</th></tr>';
				});
				innerHtml += '</thead><tbody>';

				bodyLines.forEach(function(body, i) {
					var colors = tooltip.labelColors[i];
					var style = 'background:' + colors.backgroundColor;
					style += '; border-color:' + colors.borderColor;
					style += '; border-width: 2px'; 
					var span = '<span class="chartjs-tooltip-key" style="' + style + '"></span>';
					innerHtml += '<tr><td>' + span + body + '</td></tr>';
				});
				innerHtml += '</tbody>';

				var tableRoot = tooltipEl.querySelector('table');
				tableRoot.innerHTML = innerHtml;
			}

			var position = this._chart.canvas.getBoundingClientRect();

			// Display, position, and set styles for font
			tooltipEl.style.opacity = 1;
			tooltipEl.style.left = position.left + tooltip.caretX + 'px';
			tooltipEl.style.top = position.top + tooltip.caretY + 'px';
			tooltipEl.style.fontFamily = tooltip._fontFamily;
			tooltipEl.style.fontSize = tooltip.fontSize;
			tooltipEl.style.fontStyle =...