index.html

<div class="red-container">
   <span> hello(green) </span>
   <span > 👋  </span>
   <span> Javascript Jeep </span>
    I am red
</div>


// css

<style >
  div {
  --txtColor : red;
}
span {
  --txtColor : blue;
}

div {
  color : var(--txtColor)
}
span {
     color : var(--txtColor)
}
</style>