<link href="//netdna.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//netdna.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> <div class="container"> <div class="row"> <div class="col-md-12"> <div class="input-group" id="adv-search"> <input type="text" class="form-control" placeholder="Search for snippets" /> <div class="input-group-btn" style="position:unset"> <div class="btn-group" role="group" style="position:unset"> <div class="dropdown dropdown-lg"> <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-expanded="false"><span class="caret"></span></button> <div class="dropdown-menu dropdown-menu-left" role="menu"> <form class="form-horizontal" role="form"> <div class="form-group"> <label for="filter">Filter by</label> <select class="form-control"> <option value="0" selected>All Snippets</option> <option value="1">Featured</option> <option value="2">Most popular</option> <option value="3">Top rated</option> <option value="4">Most commented</option> </select> </div> <div class="form-group"> <label for="contain">Author</label> <input class="form-control" type="text" /> </div> <div class="form-group"> <label for="contain">Contains the words</label> <input class="form-control" type="text" /> </div> <button type="submit" class="btn btn-primary"><span class="glyphicon glyphicon-search" aria-hidden="true"></span></button> </form> </div> </div> <button type="button" class="btn btn-primary"><span class="glyphicon glyphicon-search" aria-hidden="true"></span></button> </div> </div> </div> </div> </div> </div> </div>

body { padding-top: 50px; } .dropdown.dropdown-lg .dropdown-menu { margin-top: -1px; padding: 6px 20px; width: calc(100% - 70px); } .input-group-btn .btn-group { display: flex !important; } .btn-group .btn { border-radius: 0; margin-left: -1px; } .btn-group .btn:last-child { border-top-right-radius: 4px; border-bottom-right-radius: 4px; } .btn-group .form-horizontal .btn[type="submit"] { border-top-left-radius: 4px; border-bottom-left-radius: 4px; } .form-horizontal .form-group { margin-left: 0; margin-right: 0; } .form-group .form-control:last-child { border-top-left-radius: 4px; border-bottom-left-radius: 4px; } .dropdown { position:static !important; }