CSS - Pseudo-element - ::after Property

The ::after pseudo-element in CSS is used to add content after the selected element with the content property. It allows you to insert text, images, or decorative elements, without modifying the HTML structure. It is inline by default.

Syntax

selector::after {
   /* ... */
}

Use of ::after pseudo-element to add content is not advised, as it may not be accessible to the screen readers.

CSS ::after Example

Here is a simple example of usage of ::after pseudo-element:

<html>
<head>
<style>
   p {
      color: royalblue;
      font-size: 1.5em;
      border: 2px solid black;
      text-transform: lowercase;
   }
   p::after {
      content: url(images/logo.png) ;
      position: relative;
   }
</style>
</head>
<body>
   <div>
      <p>With pseudo-element ::after</p>
   </div>
</body>
</html>

Here is another example, where the usage of ::after pseudo-element alongwith other elements is demonstrated:

<html>
<head>
<style>
   body {
      width: 100%;
      height: 100vh;
      display: grid;
   }
   .glow {
      padding: 10px;
      width: 250px;
      height: 50px;
      color: #fff;
      background: #111;
      cursor: pointer;
      position: relative;
      z-index: 0;
      border-radius: 20px;
   }
   .glow::before {
      content: '';
      background: linear-gradient(60deg, #ff0000, #ff7300, #fffb00, #48ff00, #00ffd5, #002bff, #7a00ff, #ff00c8, #ff0000);
      position: absolute;
      top: -4px;
      left:-4px;
      background-size: 400%;
      z-index: -1;
      filter: blur(15px);
      width: calc(100% + 6px);
      height: calc(100% + 6px);
      animation: glowing 20s linear infinite;
      opacity: 0;
      transition: opacity .3s ease-in-out;
      border-radius: 10px;
   }
   .glow:active {
      color: rgb(246, 235, 235)
   }
   .glow:active::after {
      background: transparent;
   }
   .glow:hover::before {
      opacity: 1;
   }
   .glow::after {
      z-index: -1;
      content: '';
      position: absolute;
      width: 100%;
      height: 100%;
      background: #111;
      left: 0;
      top: 0;
      border-radius: 20px;
      background: linear-gradient(60deg, #293deb, #d019b4, #e6ac0c, #d95909, #d2ef13, #0ce45f, #a872e1, #e70db8, #2f09c8);
   }
   @keyframes glowing {
      0% { background-position: 0 0; }
      50% { background-position: 400% 0; }
      100% { background-position: 0 0; }
   }
</style>
</head>
<body>
   <button class="glow" type="button">HOVER OVER & CLICK!</button>
</body>
</html>
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