CSS 响应式登陆表单—

HTML

<div class="col">
        <a href="#" class="fb btn">
          <i class="fa fa-facebook fa-fw"></i> Login with Facebook
         </a>
        <a href="#" class="twitter btn">
          <i class="fa fa-twitter fa-fw"></i> Login with Twitter
        </a>
        <a href="#" class="google btn"><i class="fa fa-google fa-fw">
          </i> Login with Google+
        </a>
      </div>

<div class="col">
        <div class="hide-md-lg">
          <p>Or sign in manually:</p>
        </div>

<div class="bottom-container">
  <div class="row">
    <div class="col">
      <a href="#" style="color:white" class="btn">Sign up</a>
    </div>
    <div class="col">
      <a href="#" style="color:white" class="btn">Forgot password?</a>
    </div>
  </div>
</div>

CSS

JAVASCRIPT