#clock{
margin: 0 auto;
display: block;
} <canvas width="200px" height="200px" id="clock" ></canvas>
<script type="text/javascript" src="js/clock.js"></script> function drawhHour(hour, minute){
ctx.save()
ctx.beginPath();
var rad = 2 * Math.PI/12 *hour;
var mrad = 2 * Math.PI / 12 /60 * minute;
ctx.rotate(rad + mrad);
ctx.lineWidth = 5;
ctx.lineCap = "round"
ctx.moveTo(0, 10);
ctx.lineTo(0, -r/2);
ctx.stroke();
ctx.restore();
}
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