JSFiddle - React, Tailwind, and code Playground

HTML

<div id='background_img'>

</div>

<span id="another_var">asdfadfs</span>

CSS

#background_img{
background: var(--background_img_url);
    width: 661px;
    height: 431px;
}

#another_var{
color:var(--color1);
}

:root{
--background_img_url:url('https://i.imgur.com/GHiyiSx.jpeg');
--color1:red;

}