The Sass functions in _unitize.scss provide all the benefits of relative units like em and rem without the hassle of having to run calculations. Whole numbers are nice.
Unitize processes numerical values as well as those declarations that Sass identifies as lists. Lists include shorthand CSS declarations like 2px 4px 5px 3px and inset 2px 2px 4px black. Strings, colors, and values already assigned a unit (e.g., inset, #000, 20%) pass undisturbed through the function.
First, install _unitize.scss and @import 'unitize'.
The default $root-font-size is 12; to override this value, assign a new (and unitless) $root-font-size in a separate config file or at the top of your SCSS.
$root-font-size: 10;If using rems, set the document's root font size on the HTML element as pixels or a percentage. Given a $root-font-size of 10, the rulesets below yield font-sizes of 12px and 62.5%, respectively.
html {
font-size: $root-font-size + px;
font-size: percentage($root-font-size/16);
}Send values through one of em(), rem(), or unitize(). The following examples assume the default $root-font-size of 12.
unitize() returns px values:
// $root-font-size: 12;
margin: unitize(4 6% 2 9px);
// => margin: 4px 6% 2px 9px;
box-shadow: unitize(inset 5 2 #cfc);
// => box-shadow: inset 5px 2px #ccffcc;rem() returns values in rems, relative to the $root-font-size:
// $root-font-size: 12;
padding: rem(4 6 2 9);
// => padding: 0.33333rem 0.5rem 0.16667rem 0.75rem;
text-shadow: rem(3 3 6 rgba(0, 0, 0, 0.5));
// => text-shadow: 0.25rem 0.25rem 0.5rem rgba(0, 0, 0, 0.5);em() yields values relative to the $root-font-size or a font-size supplied in the optional second argument.
// $root-font-size: 12;
font-size: em(12);
// => font-size: 1em;
line-height: em(18, 12);
// => line-height: 1.5em;For examples and recommended uses, see test.scss, along with the compiled CSS in test.css.
Cleanup
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