Kod yazılı alanda neden siyah nokta çıkıyor?

<div class="nav_bottom">
            <div class="container">
                <div class="row">
                    <div class="col-sm-9">
                        <div class="navbar-header">
                            <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
                                <span class="sr-only">Toggle navigation</span>
                                <span class="icon-bar"></span>
                                <span class="icon-bar"></span>
                                <span class="icon-bar"></span>
                    </button>
                        </div>
                        <div class="mainmenu pull-left">
                            <ul class="nav navbar-nav collapse navbar-collapse">
                                <li><a href="index.html" class="active">Home</a></li>
                                <li class="dropdown"><a href="#">Shop<i class="fa fa-angle-down"></i></a>
                                    <ul role="menu" class="sub-menu">
                                        <li><a href="#">Products</a></li>
                                        <li><a href="#">Product Details</a></li>
                                        <li><a href="#">Checkout</a></li>
                                        <li><a href="#">Cart</a></li>
                                        <li><a href="#">Login</a></li>
                                    </ul>
                                </li>
                                <li class="dropdown"><a href="#">Blog<i class="fa fa-angle-down"></i></a>
                                    <ul role="menu" class="sub-menu">
                                        <li><a href="blog.html">Blog List</a></li>
                                        <li><a href="blog-single.html">Blog Single</a></li>
                                    </ul>
                                </li>
                                <li><a href="404.html">404</a></li>
                                <li><a href="contact-us.html">Contact</a></li>
                            </ul>
                        </div>
                    </div>
                     <div class="col-sm-3">
                        <div class="search_box pull-right">
                            <input type="text" placeholder="Search"/>
                        </div>
                    </div>
                    </div>
                </div>
            </div>