gistfile1.txt

<style>
    body {
        margin: 0px;
        padding: 0px;
    }
    
    #myCanvas {
        border: 1px solid red;
        width: 99.9%;
        height: 1000px;
    }
</style>


<canvas id="myCanvas" width="578" height="200">
</canvas>

<script>
    window.onload = function() {
      var canvas = document.getElementById("myCanvas");
      var context = canvas.getContext("2d");

      
      context.lineWidth = 1;
      context.lineCap = "round";
      
        context.strokeStyle = 'red';
        context.moveTo(40, 70);
        context.lineTo(400, 20);
        context.stroke();

        context.strokeStyle = 'green';        
        context.moveTo(315, 0);
        context.lineTo(167, 10);
        context.stroke();
        
    };
</script>