Text border using css (border around text)

Use multiple text shadows:

text-shadow: 2px 0 #fff, -2px 0 #fff, 0 2px #fff, 0 -2px #fff,
             1px 1px #fff, -1px -1px #fff, 1px -1px #fff, -1px 1px #fff;

body {
  font-family: sans-serif;
  background: #222;
  color: darkred;
}

h1 {
  text-shadow: 2px 0 #fff, -2px 0 #fff, 0 2px #fff, 0 -2px #fff,
               1px 1px #fff, -1px -1px #fff, 1px -1px #fff, -1px 1px #fff;
}

<h1>test</h1>

Alternatively, you could use -webkit-text-stroke, which produces a slightly different result because it modifies the stroke width instead of adding additional shadows around the text. Despite the webkit prefix, it works in most browsers (including Firefox) as of 2022:

-webkit-text-stroke: 2px #fff;

body {
  font-family: sans-serif;
  background: #222;
  color: darkred;
}

h1 {
  -webkit-text-stroke: 2px #fff;
}

<h1>test</h1>

Also, read more at CSS-Tricks.