If you're looking to kickstart your project, consider this suggestion.
I recommend separating the inline styles into their own classes, regardless of the example.
While not my preferred method, this is mostly the bootstrap way.
I changed all containers to container-fluid, which also resolved another issue I observed with responsiveness
<html>
<head>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap-theme.min.css" rel="stylesheet" />
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container-fluid" style="background-color:silver">
<div>
<h6>Add CorkBoard</h6>
</div>
<div class="container-fluid" style="background-color:white">
<div class="row row-content">
<div class="col-xs-12">
<br />
<div class="container-fluid" style="background-color:silver">
<div class="row row-content">
<div class="col-xs-12 col-sm-6 text-right">
<div class="row row-content">
<div class="col-xs-12 col-sm-6">
<h2>
<font color="black">CorkBoard</font>
</h2>
</div>
</div>
</div>
<div class="row row-content" style="padding:15px">
<div class="col-xs-12 col-sm-6">
<form action="/add-corkboard" method="POST" class="form-horizontal" role="form">
<!-- Email -->
<div class="form-group">
<label for="emailid" class="col-sm-3 control-label" style="font-weight: normal">Title</label>
<div class="col-sm-9">
<input type="email" class="form-control" id="emailid" name="emailid" placeholder="Enter your email account">
</div>
</div>
<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true">
Dropdown
<span class="caret"></span>
</button>
<ul class="dropdown-menu" aria-labelledby="dropdownMenu1">
<li><a href="#" data-value="action">Home & Garden</a></li>
<li><a href="#" data-value="another action">Education</a></li>
<li><a href="#" data-value="something else here">People</a></li>
<li><a href="#" data-value="separated link">Separated link</a></li>
</ul>
</div>
</form>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="row row-content">
<p></p>
</div>
</div>
<div class="row row-content">
<p></p>
</div>
</div>
</body>
</html>
However, with some custom CSS tweaks, you can achieve a more aesthetically pleasing layout and easily customize it according to your preferences.
<html>
<head>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap-theme.min.css" rel="stylesheet" />
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<style type="text/css" media="all">
.box {
background-color: silver;
padding-bottom: 10px;
padding-left: 10px;
padding-right: 10px;
border-bottom-left-radius: 10px;
border-bottom-right-radius: 10px;
}
.boxinabox {
background-color: white;
width: 100%;
padding: 2.5%;
}
</style>
</head>
<body>
<div class="container-fluid box">
<h6>Add CorkBoard</h6>
<div class="boxinabox">
<div class="container-fluid" style="background-color:silver">
<div class="row row-content">
<div class="col-xs-12 col-sm-6 text-right">
<div class="row row-content">
<div class="col-xs-12 col-sm-6">
<h2>
<font color="black">CorkBoard</font>
</h2>
</div>
</div>
</div>
<div class="row row-content" style="padding:15px">
<div class="col-xs-12 col-sm-6">
<form action="/add-corkboard" method="POST" class="form-horizontal" role="form">
<!-- Email -->
<div class="form-group">
<label for="emailid" class="col-sm-3 control-label" style="font-weight: normal">Title</label>
<div class="col-sm-9">
<input type="email" class="form-control" id="emailid" name="emailid" placeholder="Enter your email account">
</div>
</div>
<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true">
Dropdown
<span class="caret"></span>
</button>
<ul class="dropdown-menu" aria-labelledby="dropdownMenu1">
<li><a href="#" data-value="action">Home & Garden</a></li>
<li><a href="#" data-value="another action">Education</a></li>
<li><a href="#" data-value="something else here">People</a></li>
<li><a href="#" data-value="separated link">Separated link</a></li>
</ul>
</div>
</form>
</div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>
If this wasn't what you were asking about, I apologize for going off-topic. Please let me know if I did.