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<template>
  <div class="demo"
       :style="{
         '--hover-background-color': hoverBackgroundColor
       }"
  ></div>
</template>

<script>
  export default {
    data() {
      return {
        hoverBackgroundColor: "#ccc",
      };
    },
  };
</script>

<style>
  .demo:hover {
    background: var(--hover-background-color);
  }
</style>