I created one dropdown list using bootstrap css
I want to change the color of label when item in dropdown menu selected. But here i dont know why the dropdown items are not visible
<label> Test color </label>
<div class="col-lg-6">
            <div class="input-group">
              <input type="text" class="form-control">
              <div class="input-group-btn">
            <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown"> <span class="caret"></span></button>
            <ul class="dropdown-menu pull-right">
              <li><a href="#">yellow</a></li>
              <li><a href="#">green</a></li>
              <li><a href="#">black</a></li>
              <li class="divider"></li>
              <li><a href="#">red</a></li>
            </ul>
              </div><!-- /btn-group -->
            </div><!-- /input-group -->
          </div><!-- /.col-lg-6 -->
        </div><!-- /.row -->
How can I change the color of label when color is selected from the menu?
UPDATED CODE:
<html lang="en">
    <head>
        <link href="css/bootstrap.css" rel="stylesheet">
    <link href="css/bootstrap.min.css" rel="stylesheet">
        <!-- Custom styles for this template -->
        <link href="sticky-footer-navbar.css" rel="stylesheet">
     <script src="https://code.jquery.com/jquery-1.10.2.min.js"></script>
    </head>
<body>
<label>Test color</label>
<div class="col-lg-6">
    <div class="input-group">
        <input type="text" class="form-control">
        <div class="input-group-btn btn-default">
            <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown"> <span class="caret"></span>
            </button>
            <ul class="dropdown-menu pull-right">
                <li><a href="#">yellow</a>
                </li>
                <li><a href="#">green</a>
                </li>
                <li><a href="#">black</a>
                </li>
                <li class="divider"></li>
                <li><a href="#">red</a>
                </li>
            </ul>
        </div>
        <!-- /btn-group -->
    </div>
    <!-- /input-group -->
</div>
</body>
</html>