JSFiddle - React, Tailwind, and code Playground

by plettj

HTML

<!DOCTYPE html>
<html>
    <head><meta charset="utf-8"></head>
    <body>

        <div class="bordered">
            <h1>
            Text that will be in a box...
            </h1>
        </div>
        
        <div class="cover on"></div>
        
    </body>
</html>

CSS

body {
  background-color: #f21f14;
  --darkMode: transparent;
}
.bordered {
  background-color: green;
  border: 10px solid yellow;
  color: darkblue;
}
.cover {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.01);
}
.cover.on {
  -webkit-backdrop-filter: grayscale(100%);
  backdrop-filter: grayscale(100%);
  background-color: var(--darkMode);
}

JavaScript

document.body.style.setProperty("--darkMode", "rgba(0, 0, 0, 0.5)");
console.log("Running...");