Angular-material md-select 将背景剪切到内容边缘?

Angular-material md-select cuts off background to edge of content?

我更新到 angular-material 0.9,现在当我打开 md-select 时,它会切断内容边缘的背景。有什么办法可以避免这种情况吗?

http://codepen.io/anon/pen/yNOypa

<div class="background">
<div layout="column" layout-align="center center" flex>
  <md-select placeholder="Pick">
    <md-option value="1">One</md-option>
    <md-option value="2">Two</md-option>
  </md-select>
    </div>
  <p>The background ends at the content when md-select is open</p>
</div>

尝试改变

 height:100%;

height:100vh;

类似问题:Make div 100% height of browser window