Combine :after with :hover

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I want to combine :after with :hover in CSS (or any other pseudo selector). I basically have a list and the item with the selected class has an arrow shape applied using :after. I want the same to be true for objects that are being hovered over but cant quite get it to work. Heres the code

#alertlist {
  list-style: none;
  width: 250px;
}

#alertlist li {
  padding: 5px 10px;
  border-bottom: 1px solid #e9e9e9;
  position: relative;
}

#alertlist li.selected,
#alertlist li:hover {
  color: #f0f0f0;
  background-color: #303030;
}

#alertlist li.selected:after {
  position: absolute;
  top: 0;
  right: -10px;
  bottom: 0;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  border-left: 10px solid #303030;
  content: "";
}
<ul id="alertlist">
  <li>Alert 123</li>
  <li class="selected">Alert 123</li>
  <li>Alert 123</li>
</ul>

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