JSFiddle - React, Tailwind, and code Playground

by brigand

HTML

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Select Window Coordinates</title>
  <style>
    /* Theme settings; modify as you like */
    :root {
      --background: #444;
      --foreground: #fcfcfc;
      --background-alt: #444872;
      --foreground-alt: #9ad7e9;
      --foreground-alt-muted: #a1bdc6;

      --font-size: 16px;
      --input-scale: 2.2;
      /*
        our base is 600px wide viewport -> 16px font, so that's a scale of 37.5
      */
      --font-scale: 37.5;
      --preview-height: calc(100vw * (10 / 16));
    }

    /*
      We'll separate out the responsive typography mess. This just scales
      the UI up/down depending on the viewport size
    */
    :root {
      --rt-min-vw: 0;
      --rt-max-vw: 3000;
      --rt-min-px: 0;
      /*
        if we want to scale up to 3000px, max-px needs to be 3000 / 37.5 = 80
      */

      --rt-font-size: calc(var(--font-scale) * (100vmax / var(--rt-max-vw)));
    }
  </style>
  <style>
    /* Generic CSS Resets */
    html, body {
      margin: 0;
      padding: 0;
      box-sizing: border-box;

      width: 100%;
      height: 100%;
      overflow-x: hidden;
      overflow-y: visible;
    }

    input,
    button {
      margin: 0;
      border: 0;
      padding: 0;
      display: block;
      white-space: normal;
      background: none;
      line-height: 1;
      font-size: 1em;
      font-family: Arial;
    }

    * {
      color: inherit;
      font-size: 1em;
      box-sizing: inherit;
      font-family: inherit;
    }
  </style>
  <style>
    /* Our custom styles */

    html, body {
      width: 100%;
      height: 100%;
      background: var(--background);
      color: var(--foreground);
      font-family: Arial, Helvetica, sans-serif;
    }

    body {
      font-size: var(--rt-font-size);
    }

    body {
      box-shadow: 0 0 0 2px...