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<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" />

/*  Bootstrap */
/*
 * Globals
 */

/* Links */
a,
a:focus,
a:hover {
  color: #fff;
}

/* Custom default button */
.btn-default,
.btn-default:hover,
.btn-default:focus {
  color: #333;
  text-shadow: none; /* Prevent inheritance from `body` */
  background-color: #fff;
  border: 1px solid #fff;
}


/*
 * Base structure
 */

html,
body {
  height: 100%;
  background-color: #333;
}
body {
  color: #fff;
  text-align: center;
  text-shadow: 0 1px 3px rgba(0,0,0,.5);
}

/* Extra markup and styles for table-esque vertical and horizontal centering */
.site-wrapper {
  display: table;
  width: 100%;
  height: 100%; /* For at least Firefox */
  min-height: 100%;
  -webkit-box-shadow: inset 0 0 100px rgba(0,0,0,.5);
          box-shadow: inset 0 0 100px rgba(0,0,0,.5);
}
.site-wrapper-inner {
  display: table-cell;
  vertical-align: top;
}

/* Padding for spacing */
.inner {
  padding: 30px;
}

/*
 * Cover
 */

.cover {
  padding: 0 20px;
}
.cover .btn-lg {
  padding: 10px 20px;
  font-weight: bold;
}

<script src="https://code.jquery.com/jquery-2.2.4.min.js"></script>

function polsearch() {
  let api = "https://policy-search-api.herokuapp.com/policy-search/api/v1.0/policies?callback=?";
      
  let callback = function( response ){
    console.log( response );
      $( "#result" ).html( JSON.stringify( response , null, 2) );
  };
  $.getJSON( api, {
      status: "renewal",
      state: "all"
  }).done( callback )
  .fail( function( xhr ){
    alert("error " + xhr.responseText);
  });
}

<div class="site-wrapper">
    <div class="site-wrapper">
      <div class="site-wrapper-inner">
          <div class="inner cover">            <h1>Search</h1>
            <p class="lead">
              <a href="#" class="btn btn-lg btn-default" onclick="polsearch();">Search</a>
            </p>
            <div id="result">
            </div>
          </div>
       </div>
    </div>
  <div>