Die Zeile stammt aus der Datei in der die Mixins deklariert werden. Hier mal der komplette Inhalt.
Code:
// Mixins
// ------
// Mixins allow you to define styles that can be re-used
// throughout the stylesheet without needing to resort to
// non-semantic classes like .float-left. Mixins can also
// contain full CSS rules, and anything else allowed
// elsewhere in a Sass document. They can even take
// arguments which allows you to produce a wide variety
// of styles with very few mixins.
//
// For complete documentation:
// Sass mixins: http://sass-lang.com/docs/yardoc/file.SASS_REFERENCE.html#mixins
// Bourbon mixins: http://bourbon.io/docs/
// Import variables for use in Mixins.
@import _variables.sass
// Rounded corners mixin.
@mixin border-radius($top: 10px, $right: $top, $bottom: $top, $left: $right)
border-radius: $top $right $bottom $left
-moz-border-radius: $top $right $bottom $left
-webkit-border-top-left-radius: $top
-webkit-border-top-right-radius: $right
-webkit-border-bottom-right-radius: $bottom
-webkit-border-bottom-left-radius: $left
@mixin grid-column
width: 22%
margin: 1%
float: left
// Variables/Media Query
$tablet-width: 768px
$desktop-width: 1024px
=tablet
@media (min-width: $tablet-width) and (max-width: $desktop-width - 1px)
@content
=desktop
@media (min-width: $desktop-width)
@content