html5 - remove margin / padding space from canvas -

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I am working on the canvas object which I made the cylinder canvas object.

But I'm getting white space left, right, up & amp; How to remove those people below I tried to add CSS as the following

css 

  canvas {margin: 0 pixels; Padding: 0px; }   
 Still, it was not removing the white space.  
 Here are my suggestions for finding out my canvas object  
 Thanks in advance> Great   
 < Div class = "post-text" itemprop = "text"> 
 Edit: Just move that yellow round to the right place. Code changed:  
  var cx = 40; Var cy = 60;   
 It was  
  var cx = canvasWidth / 2; Var cy = CanvasHight / 2;   
 The witch takes it to the center of the canvas I had taken it almost to the very left border, now only you need to move that yellow thing I think it is by you Not written?

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