Mouse Cursor as Flashlight! 🖱🔦 using CSS Variables

index.html

<!-- Any website -->

<header>
  <h1>Hidden Website</h1>
  <nav>
    <a href=#>About</a>
    <a href=#>Blog</a>
    <a href=#>Contact</a>
  </nav>
</header>
<main>
  <section>
    <article>
      <h2>Hidden Headline</h2>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Perspiciatis fugit earum voluptas officia, quasi saepe et commodi, dolores cumque quam fuga ullam, itaque ea dignissimos asperiores adipisci ad eveniet repellendus!</p>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Perspiciatis fugit earum voluptas officia, quasi saepe et commodi, dolores cumque quam fuga ullam, itaque ea dignissimos asperiores adipisci ad eveniet repellendus!</p>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Perspiciatis fugit earum voluptas officia, quasi saepe et commodi, dolores cumque quam fuga ullam, itaque ea dignissimos asperiores adipisci ad eveniet repellendus!</p>
    </article>
    <article>
      <h2>Headline</h2>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Perspiciatis fugit earum voluptas officia, quasi saepe et commodi, dolores cumque quam fuga ullam, itaque ea dignissimos asperiores adipisci ad eveniet repellendus!</p>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Perspiciatis fugit earum voluptas officia, quasi saepe et commodi, dolores cumque quam fuga ullam, itaque ea dignissimos asperiores adipisci ad eveniet repellendus!</p>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Perspiciatis fugit earum voluptas officia, quasi saepe et commodi, dolores cumque quam fuga ullam, itaque ea dignissimos asperiores adipisci ad eveniet repellendus!</p>
    </article>
    <article>
      <h2>Headline</h2>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Perspiciatis fugit earum voluptas officia, quasi saepe et commodi, dolores cumque quam fuga ullam, itaque ea dignissimos asperiores adipisci ad eveniet repellendus!</p>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Perspiciatis fugit earum voluptas officia, quasi saepe et commodi, dolores cumque quam fuga ullam, itaque ea dignissimos asperiores adipisci ad eveniet repellendus!</p>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Perspiciatis fugit earum voluptas officia, quasi saepe et commodi, dolores cumque quam fuga ullam, itaque ea dignissimos asperiores adipisci ad eveniet repellendus!</p>
    </article>
  </section>
  <aside>
    <div class=capsule>
      <h3>Widget Headline</h3>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>
    </div>
    <div class=capsule>
      <h3>Widget Headline</h3>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>
    </div>
    <div class=capsule>
      <h3>Widget Headline</h3>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>
    </div>
  </aside>
</main>
<footer>footer content</footer>

mouse-cursor-as-flashlight-using-css-variables.markdown

Mouse Cursor as Flashlight! 🖱🔦 using CSS Variables

A Pen by Tommy Hodgins on CodePen.

License.

script.js

function update(e){
  var x = e.clientX || e.touches[0].clientX
  var y = e.clientY || e.touches[0].clientY

  document.documentElement.style.setProperty('--cursorX', x + 'px')
  document.documentElement.style.setProperty('--cursorY', y + 'px')
}

document.addEventListener('mousemove',update)
document.addEventListener('touchmove',update)

scripts

<script src="https://cdnjs.cloudflare.com/ajax/libs/eqcss/1.5.0/EQCSS-polyfills.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/eqcss/1.5.0/EQCSS.min.js"></script>

style.css

/* Flashlight Overlay */
:root {
  cursor: none;
  --cursorX: 50vw;
  --cursorY: 50vh;
}
:root:before {
  content: '';
  display: block;
  width: 100%;
  height: 100%;
  position: fixed;
  pointer-events: none;
  background: radial-gradient(
    circle 10vmax at var(--cursorX) var(--cursorY),
    rgba(0,0,0,0) 0%,
    rgba(0,0,0,.5) 80%,
    rgba(0,0,0,.95) 100%
  )
}

styles

<link href="//fonts.googleapis.com/css?family=Fira+Sans:300,400,500,700,300italic,400italic,500italic,700italic" rel="stylesheet" />
<link href="//fonts.googleapis.com/css?family=Source+Sans+Pro:200,300,400,600,700,900,200italic,300italic,400italic,600italic,700italic,900italic" rel="stylesheet" />
<link href="//fonts.googleapis.com/css?family=Source+Code+Pro:300,400,500,600,700,900" rel="stylesheet" />

Is there any way to set this effect inside a wrapper instead of hole the page?

I tried but I didn't got it.