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HTML

              
                <body>
  <div id="canvas-container">
    <canvas id="canvas" width="600" height="300"></canvas>
  </div>
</body>
              
            
!

CSS

              
                #canvas-container {
   width: 100%;
   text-align:center;
}

canvas {
   display: inline;
}
              
            
!

JS

              
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