<!DOCTYPE html>
<html ng-app="plunker">

  <head>
    <script data-require="jquery@2.2.4" data-semver="2.2.4" src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
    <link data-require="bootstrap@3.3.7" data-semver="3.3.7" rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" />
    <script data-require="bootstrap@3.3.7" data-semver="3.3.7" src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
    <script data-require="angular.js@1.4.6" data-semver="1.4.6" src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.7/angular.min.js"></script>
    <link rel="stylesheet" href="style.css" />
    <script src="script.js"></script>
  </head>

  <body ng-controller="MainCtrl">
    <div class="panel panel-default">
      <div class="panel-heading">
                Informações do Imóvel 
            </div>
      <div class="flex-container">
        <div class="input-group flex-item">
          <span class="input-group-addon">
            <label>Título</label>
          </span>
          <input class="form-control" id="name" name="name" placeholder="Name" type="text" />
        </div>
        <div class="input-group flex-item">
          <span class="input-group-addon">
            <label>Título</label>
          </span>
          <input class="form-control" id="name" name="name" placeholder="Name" type="text" />
        </div>
        <div class="input-group flex-item">
          <span class="input-group-addon">
            <label>Título</label>
          </span>
          <input class="form-control" id="name" name="name" placeholder="Name" type="text" />
        </div>
      </div>
    </div>
  </body>

</html>
.flex-container {
  padding: 0;
  margin: 0;
  list-style: none;
  
  -ms-box-orient: horizontal;
  display: -webkit-box;
  display: -moz-box;
  display: -ms-flexbox;
  display: -moz-flex;
  display: -webkit-flex;
  display: flex;
}

.flex-item {
  justify-content: center;
  width: 33.3%;
  padding: 10px;
}


var app = angular.module('plunker', []);

app.controller('MainCtrl', function($scope) {
  
});