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                <div style="text-align:center">
  <svg height="150" width="400" id='svg'>
    <polyline id="polyline-id" fill="none" stroke="#005c66" stroke-width="1" />




                var svg = document.getElementById('svg');
var polyline= document.getElementById('polyline-id');
var width = 400;
var height = 150;
var x = 0;

  //Create the new point and increment the x for the next point
  var point = svg.createSVGPoint();
  point.x = x;
  point.y = height - Math.floor((Math.random() * height));
  //Reset the x axis points when the line reaches the width
  if (polyline.points.length > width) { 
    //Remove the first point to make space for the last point
    //Reset x points
    for (var j=0; j<width; j++) { 
      polyline.points[j].x = j;
}, 100);