glowing border css code example

Example 1: css glow effect

div {
    width: 150px;
    height: 150px;
    background-color: #fff;

    box-shadow: 120px 80px 40px 20px #0ff;
    /* in order: x offset, y offset, blur size, spread size, color */
    /* blur size and spread size are optional (they default to 0) */
}

Example 2: inner border css

div {
    box-sizing: border-box;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    width: 100px;
    height: 100px;
    border: 20px solid #f00;
    background: #00f;
    margin: 10px;
}

div + div {
    border: 10px solid red;
}

Example 3: css feather border

-moz-box-shadow: 1px 2px 3px rgba(0,0,0,.5);
-webkit-box-shadow: 1px 2px 3px rgba(0,0,0,.5);
box-shadow: 1px 2px 3px rgba(0,0,0,.5);

/* From further on in the answer:
1px: Horizontal offset of the effect. Positive numbers shift it right, negative left.
2px: Vertical offset of the effect. Positive numbers shift it down, negative up.
3px: The blur effect.  0 means no blur.
color: The color of the shadow.
*/

Example 4: corner border css

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title></title>
  <style>
  #content {
  width: max-content;
  height: fit-content;

  background:
    linear-gradient(to right, black 4px, transparent 4px) 0 0,
    linear-gradient(to right, black 4px, transparent 4px) 0 100%,
    linear-gradient(to left, black 4px, transparent 4px) 100% 0,
    linear-gradient(to left, black 4px, transparent 4px) 100% 100%,
    linear-gradient(to bottom, black 4px, transparent 4px) 0 0,
    linear-gradient(to bottom, black 4px, transparent 4px) 100% 0,
    linear-gradient(to top, black 4px, transparent 4px) 0 100%,
    linear-gradient(to top, black 4px, transparent 4px) 100% 100%;

  background-repeat: no-repeat;
  background-size: 20px 20px;
}
  </style>
  </head>
  <body>
    <div id="content">  </div>
  </body>
</html>

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