Top border not seen

by amrutaJgtp

HTML

<script src="https://code.highcharts.com/highcharts.js"></script>

<div id="container"></div>

JavaScript

Highcharts.chart('container', {
  "chart": {
    "zoomType": "xy"
  },
  "tooltip": {
    "enabled": true
  },
  "legend": {
    "enabled": true,
    "borderWidth": 0,
    "layout": "horizontal",
    "align": "center",
    "verticalAlign": "bottom"
  },
  "yAxis": [{
    "title": {
      "text": "Margin"
    },
    "opposite": false,
    "axisInternalName": "0",
    "labels": {
      "enabled": true,

      "align": "center"
    },
    "lineWidth": 0,
    "lineColor": "rgba(174,174,174,1)",
    "tickWidth": 0,
    "allowDecimals": false,
    "reversed": false,
    "id": "yAxis0",
    "gridLineWidth": 0,
    "gridLineColor": "#C0C0C0"
  }],
  "xAxis": {
    "title": {
      "text": "Country Dim"
    },
    "opposite": false,
    "axisInternalName": "0",
    "labels": {
      "enabled": true
    },
    "lineWidth": 1,
    "lineColor": "rgba(174,174,174,1)",
    "id": "xAxis0",
    "tickWidth": 1,
    "categories": [
      "The Bahamas",
      "Australia",
      "USA",
      "Canada",
      "Argentina",
      "Iceland",
      "UK",
      "Algeria",
      "India",
      "China",
      "Brazil"
    ],
    "tickmarkPlacement": "on",
    "gridLineWidth": 0,
    "gridLineColor": "#C0C0C0"
  },

  "series": [{
      "zIndex": 2,
      "internalName": "Margin_msr",
      "type": "column",
      "yAxis": 0,
      "data": [{
          "y": 115
        },
        {
          "y": 228
        },
        {
          "y": 669
        },
        {
          "y": 198
        },
        {
          "y": 537
        },
        {
          "y": 218
        },
        {
          "y": 681
        },
        {
          "y": 628
        },
        {
          "y": 96
        },
        {
          "y": 143
        },
        {
          "y": 896
        }
      ],
      "name": "Margin",
      "showInLegend": true,
      "dataLabels": {
        "enabled": true,
        "eQPosition": 1,
        "borderWidth": 0,
        "align": "center",
        "inside": false,
        "rotation": 0,
...