如何删除this codepen底部和页脚div之间的空格。我已经尝试了this SO post上的建议，但似乎不起作用。谢谢。

* {
  margin: 0;
  padding: 0;
}

body {
  background-color: grey;
  bottom: 0;
  margin: 0;
}

.container {
  height: 2000px;
  background-color: white;
}

.footer {
   position: relative;
   left: 0;
   bottom: 0;
   width: 100%;
   background-color: green;
   color: white;
   text-align: center;
  margin: 0;
}

<div class="container">
  <div class="row">
    <div class="col-12">
    <h2>Lorem ipsum</h2>
    <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
    </div>
  </div>
</div>

<div class="footer">
  <p>Footer</p>
</div>