<p style="font-size: var(--size-lg)">
  Lorem ipsum dolor sit amet consectetur adipisicing elit. Voluptates neque iure atque perferendis harum, excepturi, amet laboriosam nam quidem et eligendi reprehenderit similique eius maiores animi voluptatem error ab in.
</p>

<p style="--color: blue">
  Lorem ipsum dolor sit amet consectetur adipisicing elit. Voluptates neque iure atque perferendis harum, excepturi, amet laboriosam nam quidem et eligendi reprehenderit similique eius maiores animi voluptatem error ab in.
</p>
html {
  --size-lg: 1.25rem;
  --size-sm: .8rem;
  --color: black;
}

p {
  color: var(--color);
}

External CSS

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