CSS Cascading and Inheritance

#example-element {
  color: gold;
  padding: 10px;
  font-size: 1.5rem;
  text-align: left;
  width: 100%;
}

.example-container {
  border: 2px dashed #2d5ae1;
}

.example-container-bg {
  background-color: #77767b;
  padding: 20px;
}

<section id="default-example">
  <div class="example-container-bg">
    <div class="example-container">
      <p id="example-element">
        This paragraph has a font size of 1.5rem and a color of gold. It also
        has 1rem of vertical margin set by the user-agent. The parent of the
        paragraph is a &lt;div&gt; with a dashed blue border.
      </p>
    </div>
  </div>
</section>

@layer module, state;

@layer state {
  .alert {
    background-color: brown;
  }
  p {
    border: medium solid limegreen;
  }
}

@layer module {
  .alert {
    border: medium solid violet;
    background-color: yellow;
    color: white;
  }
}

<p class="alert">Beware of the zombies</p>

div {
  padding: 10px;
}

@scope (.light-scheme) {
  :scope {
    background-color: plum;
  }

  a {
    color: darkmagenta;
  }
}

@scope (.dark-scheme) {
  :scope {
    background-color: darkmagenta;
    color: antiquewhite;
  }

  a {
    color: plum;
  }
}

<div class="light-scheme">
  <p>
    MDN contains lots of information about
    <a href="/en-US/docs/Web/HTML">HTML</a>,
    <a href="/en-US/docs/Web/CSS">CSS</a>, and
    <a href="/en-US/docs/Web/JavaScript">JavaScript</a>.
  </p>
</div>

<div class="dark-scheme">
  <p>
    MDN contains lots of information about
    <a href="/en-US/docs/Web/HTML">HTML</a>,
    <a href="/en-US/docs/Web/CSS">CSS</a>, and
    <a href="/en-US/docs/Web/JavaScript">JavaScript</a>.
  </p>
</div>