< html >
<head>
<title>bootstrap</title>
<meta charset="UTF-8">
<link rel="stylesheet" href="../css/bootstrap.css">
<link rel="stylesheet" href="../css/bootstrap.min.css">
<link rel="stylesheet" href="../css/bootstrap-theme.css">
<link rel="stylesheet" href="../css/bootstrap-theme.min.css">
<link rel="stylesheet" href="../css/bootstrap-grid.css">
<link rel="stylesheet" href="../css/bootstrap-grid.min.css">
<link rel="stylesheet" href="../css/bootstrap-reboot.css">
<link rel="stylesheet" href="../css/bootstrap-reboot.min.css">
</head>
<body>
<div class="row" style="margin-top:80px;">
<div class="col-sm-3">
<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button" id="dropdown1" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true">
<span class="caret"></span>
</button>
<ul class="dropdown-menu" aria-labelledby="dropdown1">
<li><a href="-sharp"></a></li>
<li><a href="-sharp"></a></li>
<li><a href="-sharp"></a></li>
<li><a href="-sharp"></a></li>
</ul>
</div>
</div>
<div class="col-sm-3">
<div class="dropup">
<button class="btn btn-default dropdown-toggle" type="button" id="dropdown2" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true">
()
<span class="caret"></span>
</button>
<ul class="dropdown-menu" aria-labelledby="dropdown2">
<li><a href="-sharp"></a></li>
<li><a href="-sharp"></a></li>
<li><a href="-sharp"></a></li>
<li><a href="-sharp"></a></li>
</ul>
</div>
</div>
<div class="col-sm-3">
<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button" id="dropdown3" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true">
<span class="caret"></span>
</button>
<ul class="dropdown-menu" aria-labelledby="dropdown3">
<li><a href="-sharp"></a></li>
<li><a href="-sharp"></a></li>
<li><a href="-sharp"></a></li>
<li role="separator" class="divider"></li>
<li><a href="-sharp"></a></li>
</ul>
</div>
</div>
<div class="col-sm-3">
<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button" id="dropdown4" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true">
()
<span class="caret"></span>
</button>
<ul class="dropdown-menu" aria-labelledby="dropdown4">
<li class="dropdown-header"></li>
<li><a href="-sharp"></a></li>
<li><a href="-sharp"></a></li>
<li><a href="-sharp"></a></li>
<li class="dropdown-header"></li>
<li><a href="-sharp"></a></li>
</ul>
</div>
</div>
</div>
<script text="javascript" src="../js/jquery-3.3.1.min.js"></script>
<script text="javascript" src="../js/bootstrap.js"></script>
<script text="javascript" src="../js/bootstrap.min.js"></script>
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