JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.6/css/bootstrap.min.css">
<div class="fluid-container" id="loginScreen">
  <div class="flexbox-container">
    <div class="col-md-4 col-lg-4 col-sm-12 col-xs-12 col-md-offset-4 col-lg-offset-4">
      <div class="panel panel-default">
        <div class="panel-heading">
          <h3 class="text-center">Login</h3>
        </div>
        <div class="panel-body">
          <form name="login">
            <div class="form-group">
              <label>Username</label>
              <input type="text" class="form-control" name="loginCtrl.login.username">
            </div>
            <div class="form-group">
              <label>Password</label>
              <input type="password" class="form-control" name="loginCtrl.login.password">
            </div>
            <div class="form-group">
              <div class="checkbox col-md-8 col-lg-8 col-sm-12 colxs-12 noleftpadding">
                <label>
                  <input type="checkbox"> Remember Me.
                </label>
              </div>
              <div class="col-md-4 col-lg-4 col-sm-12 col-xs-12 norightpadding">
                <button type="button" class="pull-right btn btn-md btn-primary">Login</button>
              </div>
            </div>
          </form>
        </div>
        <div class="panel-footer">
          <div class="btn-group btn-group-justified" role="group" aria-label="...">
            <div class="btn-group" role="group">
              <button type="button" class="btn btn-default">Forgot Password</button>
            </div>
            <div class="btn-group" role="group">
              <button type="button" class="btn btn-default">Register</button>
            </div>
            <div class="btn-group" role="group">
              <button type="button" class="btn btn-default">View Demo</button>
            </div>
          </div>
        </div>
      </div> 
    </div>
  </div>

CSS

.flexbox-container {
	display: -ms-flexbox;
	display: -webkit-flex;
	display: flex;
	-ms-flex-align: center;
	-webkit-align-items: center;
	-webkit-box-align: center;.
	align-items: center;
}