Primer CSS Em-based Spacing

Last Updated : 26 Apr, 2025

Primer CSS Spacing contains Em-based Spacing which is mainly used to provide the spacing between the components, having the values in em, for which the value combined with typography, line height, or the total height becomes sensible numbers.

GitHub's body font size is 14px which is difficult to work with, so we sometimes can't achieve a whole number. Variables listed below are preferred for use within components and custom CSS.

Variables	Fraction	Y Padding (em)	Total height at 14px	Total height at 16px
$em-spacer-1	1/16	.0625	22.75	26
$em-spacer-2	1/8	.125	24.5	28
$em-spacer-3	1/4	.25	28	32
$em-spacer-4	3/8	.375	31.5	36
$em-spacer-5	1/2	.5	35	40
$em-spacer-6	3/4	.75	42	48

Syntax:

$name-of-the-variable: value;

Below examples illustrate the Primer CSS Em-based Spacing

Example 1: In this example, we will render two buttons, by creating our own variable $em-spacer-12 that will hold the value of 1em.

HTML

<!DOCTYPE html> <html lang="en">  <head>     <meta charset="UTF-8">     <meta http-equiv="X-UA-Compatible" content="IE=edge">     <meta name="viewport" content="width=device-width, initial-scale=1.0">     <link href= "https://unpkg.com/@primer/css@^20.2.4/dist/primer.css" rel="stylesheet" />  </head>  <body>     <div class="text-center">         <h1 class="color-fg-success">             GeeksforGeeks         </h1>         <h2>Primer CSS Em-based Spacing</h2>         <br>         <div class="gap mx-4">             <button class="color-bg-success">                 <p>Button 1</p>             </button>             <button class="color-bg-success">                 <p>Button 2</p>             </button>         </div>     </div> </body>  </html>

SCSS:

$em-spacer-12: 1em;  .gap {        gap:$em-spacer-12;  }

CSS:

.gap{      gap: 1em;        }

Output:

Example 2: In this example, we will use spacing inside of the button element as padding.

HTML

<!DOCTYPE html> <html lang="en">  <head>     <meta charset="UTF-8">     <meta http-equiv="X-UA-Compatible" content="IE=edge">     <meta name="viewport" content="width=device-width, initial-scale=1.0">     <link href= "https://unpkg.com/@primer/css@^20.2.4/dist/primer.css" rel="stylesheet" /> </head>  <body>     <div class="text-center">         <h1 class="color-fg-success">             GeeksforGeeks         </h1>         <h2>Primer CSS Em-based Spacing</h2>         <br>         <div class="mx-4">             <button class="color-bg-success">                 <p class="left">Button 1</p>             </button>         </div>     </div> </body>  </html>

SCSS:

$em-spacer-12: 1em;  .left {        padding:$em-spacer-12;  }

CSS:

.left{      padding: 1em;        }

Output:

References: https://primer.style/css/support/spacing

Primer CSS Extended Spacing Scale

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