Importance

HTML

<!-- Learn about this code on MDN: https://developer.mozilla.org/en-US/docs/Learn/CSS/Introduction_to_CSS/Cascade_and_inheritance -->

<p class="better">This is a paragraph.</p>
<p class="better" id="winning">One selector to rule them all!</p>

CSS

#winning {
  background-color: red;
  border: 1px solid black;
}

.better {
  background-color: gray;
  border: none !important;
}

p {
  background-color: blue;
  color: white;
  padding: 5px;
}