:last-of-type

/* Selects any <p> that is the last element
   of its type among its siblings */
p:last-of-type {
  color: lime;
}

<h2>Heading</h2>
<p>Paragraph 1</p>
<p>Paragraph 2</p>

p:last-of-type {
  color: red;
  font-style: italic;
}

<article>
  <div>This `div` is first.</div>
  <div>This <span>nested `span` is last</span>!</div>
  <div>This <em>nested `em` is first</em>, but this <em>nested `em` is last</em>!</div>
  <b>This `b` qualifies!</b>
  <div>This is the final `div`!</div>
</article>

article :last-of-type {
  background-color: pink;
}