[解決済み] CSSでuse textを背景にする方法はありますか？

#container {
   position: relative;
}

#background {
   position: absolute;
   top: 0;
   left: 0;
   bottom: 0;
   right: 0;
   z-index: -1;
   overflow: hidden;
}

<div id="container">
    <div id="background">
    Text to have as background
    </div>
    Normal contents
</div>