-thumb-background</span><span class="p">:</span> <span class="nf">rgba</span><span class="p">(</span><span class="nf">lighten</span><span class="p">(</span><span class="nv">$color-muted</span><span class="o">,</span> <span class="m">10%</span><span class="p">)</span><span class="o">,</span> <span class="nv">$opacity-more-muted</span><span class="p">)</span> <span class="o">!</span><span class="nb">default</span>
</code></pre></div></div>
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<p>Default scrollbar thumb background fo