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346 B

<script>
let bgOpacity = 0.5;
$: color = bgOpacity < 0.6 ? "#000" : "#fff";
</script>
<input type="range" min="0" max="1" step="0.1" bind:value={bgOpacity} />
<p style:color style:--opacity={bgOpacity}>This is a paragraph.</p>
<style>
p {
font-family: "Comic Sans MS", cursive;
background: rgba(255, 62, 0, var(--opacity));
}
</style>