CodePen Embed - :not and specificity

<div class="red"></div>
<div></div>

body {
  width: fit-content;
  margin: 20px auto;
}

div {
  height: 200px;
  margin: 1em;
  width: 200px;
  display: inline-block;
}

div:not(.foobar) {
  background-color: black;
}

.red {
  background-color: red;
}

@media (max-width: 500px) {
  div {
    display: block;
  }
}

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