HTML: Bootstrap - Full width login form

gistfile1

<div class="container">
    <div class="row">
        <div class="span4 offset4 well">
            <legend>Please Sign In</legend>
            <div class="alert alert-error">
                <a class="close" data-dismiss="alert" href="#">×</a>
                Incorrect Username or Password!
            </div>
            <form method="POST" action="" accept-charset="UTF-8">
                <input type="text" id="username" class="span4" name="username" placeholder="Username">
                <input type="password" id="password" class="span4" name="password" placeholder="Password">
                <label class="checkbox">
                    <input type="checkbox" name="remember" value="1">Remember Me</label>
                <button type="submit" name="submit" class="btn btn-info btn-block">Sign in</button>
            </form>
        </div>
    </div>
</div>