It's possible to use the theme function within arbitrary values to reference the design tokens in your tailwind.config.js file.
<div class="grid grid-cols-[fit-content(theme(spacing.32))]">
<!-- ... -->
</div><TopicsFilter
currentTopic={topicParam}
topics={postTopics}
category={category}
className="md:sticky md:top-[calc(theme(spacing.headerHeight)+3rem)] md:[grid-area:filter]"
/>From the Tailwind CSS↗ docs.