The following code shows how to center Login Form.
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'
src='http://code.jquery.com/jquery-1.8.3.js'></script>
<script type='text/javascript'
src="http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/2.1.0/bootstrap.min.js"></script>
<link rel="stylesheet" type="text/css"
href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.0/css/bootstrap-combined.min.css">
<style type='text/css'>
.container {<!-- w w w . ja v a 2 s. c o m-->
margin-top: 10px;
}
.hero-unit {
padding: 50px 50px 50px 50px;
}
.form-horizontal .control-label {
width: 61px;
}
.form-horizontal .controls {
margin-left: 80px;
}
/* Landscape phone to portrait tablet */
@media ( max-width : 767px) {
}
/* Landscape phones and down */
@media ( max-width : 480px) {
.hero-unit {
margin-left: -20px;
margin-right: -20px;
}
.form-horizontal .controls {
margin-left: 0;
}
}
</style>
</head>
<body>
<div class="container">
<div class="hero-unit">
<div class="row-fluid">
<div class="offset4 span4">
<legend>Sign in to WebApp</legend>
<form class="form-horizontal">
<div class="control-group">
<label class="control-label" for="inputEmail">Email</label>
<div class="controls">
<input type="text" id="inputEmail" placeholder="Email">
</div>
</div>
<div class="control-group">
<label class="control-label" for="inputPassword">Password</label>
<div class="controls">
<input type="password" id="inputPassword" placeholder="Password">
</div>
</div>
<div class="control-group">
<div class="controls">
<label class="checkbox"> <input type="checkbox">Remember
me
</label>
<button type="submit" class="btn">Sign in</button>
</div>
</div>
</form>
</div>
</div>
</div>
</div>
</body>
</html>