z-index doesn't work with ::after/::before element?
<p>z-index doesn't work with its <code>::before</code>/<code>::after</code> element. Here I'm sharing code below.</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-css lang-css prettyprint-override"><code>.or {
  border: 2px solid #8fc300;
  border-radius: 5px;
  color: #333;
  font-size: 17px;
  font-weight: 600;
  height: 34px;
  line-height: 26px;
  text-align: center;
  width: 34px;
  margin-top: 64px;
  margin-left: 20px;
  margin-right: 20px;
  background: #fff;
  /*For z-index - keep the green area on top*/
  position: relative;
  z-index: 11;
}
.or::after {
  background: red;
  content: "";
  display: block;
  height: 116px;
  margin-left: 15px;
  margin-top: -68px;
  width: 4px;
  /*For z-index - keep the green area on top*/
  position: relative;
  z-index: 9;
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="or"&gt;&lt;/div&gt;</code></pre>
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</p>