<!DOCTYPE HTML>
<html>
<head>
<style>
body {
margin: 0px;
padding: 0px;
}
#myCanvas {
border: 1px solid #B8B7B9;
}
</style>
<script>
window.onload = function() {
var canvas = document.getElementById("myCanvas");
var context = canvas.getContext("2d");
/////////////////////////////////////////////////////
var x = 100;
var y = 100;
var width = 600;
var height = 400;
var centerX = canvas.width / 2;
var centerY = canvas.height / 2;
context.beginPath();
context.rect(x,y,width,height);
var grd=context.createRadialGradient(centerX, centerY, 30, centerX, centerY, 300);
grd.addColorStop(0, "#F50000");
grd.addColorStop(0.25, "FF771B");
grd.addColorStop(0.5, "#AC2BF7");
grd.addColorStop(0.75, "#FF86E8");
grd.addColorStop(1, "#130BFD");
context.fillStyle = grd;
context.fill();
context.stroke();
////////////////////////////////////////////////////
};
</script>
</head>
<body>
<canvas id="myCanvas" width="800" height="600"></canvas>
</body>
</html>
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