<template>
  <div id="nav">
    <router-link to="/">Home</router-link>|
    <router-link to="/about">About</router-link>
  </div>
  <router-view />
</template>

<script setup>
const color =  "yellow"
</script>

<style lang="scss">
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
}

#nav {
  padding: 30px;
  // background-color: v-bind(color); 

  a {
    font-weight: bold;
    color: #2c3e50;

    &.router-link-exact-active {
      color: #42b983;
    }
  }
}
</style>

<div id="nav" style="--7ba5bd90-color:yellow;">
  ... 
</div>