[css] How to make canvas responsive

You can have a responsive canvas in 3 short and simple steps:

  1. Remove the width and height attributes from your <canvas>.

    <canvas id="responsive-canvas"></canvas>
    
  2. Using CSS, set the width of your canvas to 100%.

    #responsive-canvas {
      width: 100%;
    }
    
  3. Using JavaScript, set the height to some ratio of the width.

    var canvas = document.getElementById('responsive-canvas');
    var heightRatio = 1.5;
    canvas.height = canvas.width * heightRatio;
    

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