Embedded Widget CSS change

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<div class="container-fluid">
  <div class="row">
    <div class="col-md-6 col-xs-6 col-lg-6 col-sm-6">
              <!-- TradingView Widget BEGIN -->
      <div class="tradingview-widget-container">
          <div class="tradingview-widget-container__widget"></div>
          <script type="text/javascript" src="https://s3.tradingview.com/external-embedding/embed-widget-market-overview.js" async>
  {
  "showChart": true,
  "locale": "en",
  "largeChartUrl": "",
  "width": "400",
  "height": "660",
  "plotLineColorGrowing": "rgba(60, 188, 152, 1)",
  "plotLineColorFalling": "rgba(255, 74, 104, 1)",
  "gridLineColor": "rgba(233, 233, 234, 1)",
  "scaleFontColor": "rgba(218, 221, 224, 1)",
  "belowLineFillColorGrowing": "rgba(60, 188, 152, 0.05)",
  "belowLineFillColorFalling": "rgba(255, 74, 104, 0.05)",
  "symbolActiveColor": "rgba(242, 250, 254, 1)",
  "tabs": [
    {
      "title": "Indices",
      "symbols": [
        {
          "s": "INDEX:SPX",
          "d": "S&P 500"
        },
        {
          "s": "INDEX:IUXX",
          "d": "Nasdaq 100"
        },
        {
          "s": "INDEX:DOWI",
          "d": "Dow 30"
        },
        {
          "s": "INDEX:NKY",
          "d": "Nikkei 225"
        },
        {
          "s": "NASDAQ:AAPL",
          "d": "Apple"
        },
        {
          "s": "NASDAQ:GOOG",
          "d": "Google"
        },
        {
          "s": "MIL:FB",
          "d": "Facebook"
        }
      ],
      "originalTitle": "Indices"
    },
    {
      "title": "Commodities",
      "symbols": [
        {
          "s": "CME_MINI:ES1!",
          "d": "E-Mini S&P"
        },
        {
          "s": "CME:E61!",
          "d": "Euro"
        },
        {
          "s": "COMEX:GC1!",
          "d": "Gold"
        },
        {
          "s":...