More-CSS/CSS-aspect-ratio-neon-effect.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>CSS Aspect-Ratio & Neon Effect</title>
    <style>
      .wrapper {
        width: 100vw;
        height: 100vh;
        display: grid;
        place-items: center;
        background: steelblue;
      }
      .box {
        width: 600px;
        height: 0;
        padding-bottom: calc(600px * 9 / 16); /*Aspect Ratio:16/9*/
        background: black;
        box-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #fff, 0 0 20px #49ff18,
          0 0 30px #49ff18, 0 0 40px #49ff18, 0 0 55px #49ff18, 0 0 75px #49ff18;
      }
      .box h1 {
        color: white;
        text-align: center;
        margin-top: 150px;
        font-size: 3rem;
        letter-spacing: 5px;
        text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #fff,
          0 0 20px #49ff18, 0 0 30px #49ff18, 0 0 40px #49ff18, 0 0 55px #49ff18,
          0 0 75px #49ff18;
      }
    </style>
  </head>
  <body>
    <div class="wrapper">
      <div class="box">
        <h1>Pain</h1>
      </div>
    </div>
  </body>
</html>