:last-of-type

dt {
  font-weight: bold;
}

dd {
  margin: 3px;
}

dd:last-of-type {
  border: 2px solid orange;
}

<dl>
  <dt>Vegetables:</dt>
  <dd>1. Tomatoes</dd>
  <dd>2. Cucumbers</dd>
  <dd>3. Mushrooms</dd>
  <dt>Fruits:</dt>
  <dd>4. Apples</dd>
  <dd>5. Mangos</dd>
  <dd>6. Pears</dd>
  <dd>7. Oranges</dd>
</dl>

:last-of-type {
  /* ... */
}

<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>
  <p>This `p` qualifies!</p>
  <div>This is the final `div`!</div>
</article>

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

<p>This `p` is not selected.</p>
<p>This `p` is not selected either.</p>
<p>
  This `p` is last `p` element of its parent e.g. `body` selected by `p` type
  selector.
</p>
<div class="container">
  <div class="item">This `div` is not selected.</div>
  <div class="item">This `div` is not selected either.</div>
  <div class="item">
    This `div` is last `div` element of its parent `div` selected by `.container
    .item` class selector.
  </div>
  <p class="item">
    This `p` is last `p` element of its parent `div` selected by `.container
    .item` class selector.
  </p>
</div>

p:last-of-type {
  background: skyblue;
}

.container .item:last-of-type {
  color: red;
  font-weight: bold;
}