title: Can I use '/deep/' to all elements or parent's element
body: <p>I'm using element-ui and I have some needs to edit fixed styles which isn't provided as options.
  I tried to modify such things inside scoped-style-sheet and I found that some of those things are only able to be modified in not-scoped style-sheet. And then after I found that "/deep/" can do what I want.
  so Here is my question</p>
  
  <blockquote>
    <p>Can I use /deep/ to my Top-parent element in my vue page? Or are there
    any problems it can cause?</p>
  </blockquote>
  
  <pre><code>&lt;style lang="scss" scoped&gt;
  /deep/.wrapper {
      .some-class{
          /*and so on...*/
      }
  }
  &lt;/style&gt;
  </code></pre>