KNACSS/sass/_00-config.scss

// Config file : variables, mixins, ...

// font sizes
$base-font-size	: 14px; // if "14px" then 1em = 14px
$line-height	: 1.5; // equiv line-height 1.5
$h1-size		: 3.2rem; // equiv "32px"
$h2-size		: 2.8rem; // equiv "28px"
$h3-size		: 2.4rem; // equiv "24px"
$h4-size		: 2.0rem; // equiv "20px"
$h5-size		: 1.8rem; // equiv "18px"
$h6-size		: 1.6rem; // equiv "16px"

// font stacks
$font-stack-common		: Helvetica, Arial, sans-serif; // common font
$font-stack-headings	: Helvetica, Arial, sans-serif; // headings font
$font-stack-monospace	: Consolas, 'DejaVu Sans Mono', Courier, monospace; // monospace font
$font-stack-universal	: FreeSans, Arimo, "Droid Sans", Helvetica, Arial, sans-serif; // universal stack

// font colors
$base-color					: #000; // text color on body and content
$primary-color				: #000; // text color on primary elements
$secondary-color			: #000; // text color on secondary elements
$headings-color				: #000; // text color on headings
$base-color-link			: #333; // base links color
$base-color-link-hover		: #000; // base hovered/focused links color

// backgrounds
$base-background		: #fff; // body background color
$primary-background		: #fff; // primary elements background color
$secondary-background	: #fff; // secondary elements background color

// spacings (choose unit you prefer)
$tiny-value				: 5px; // tiny value for margins / paddings
$small-value			: 10px; // small value for margins / paddings
$medium-value			: 20px; // medium value for margins / paddings
$large-value			: 40px; // large value for margins / paddings
$extra-large-value		: 80px; // extra large value for margins / paddings
$ultra-large-value		: 160px; // ultra large value for margins / paddings

// breakpoints (choose unit you prefer)
$tiny-screen			: 480px; // tiny screens media query (less than 480px)
$small-screen			: 768px; // screens between 481px and 768px
$medium-screen			: 1024px; // screens between 769px and 1024px
$large-screen			: 1280px; // screens between 1025px and 1280px
$extra-large-screen		: 1600px; // screens between 1281px and 1600px
$ultra-large-screen		: 1920px; // ultra large screens

// misc (choose unit you prefer)
$gutter		: 20px; // gutter value for grid layouts. Unit can be: %, px, em, rem

// Sass mixins : don't touch or you'll be banned ;)
// px to em/rem 

@mixin rem($size) {	
	@if unitless($size) {
	 	font-size: ($size * 1rem) / 1rem * $base-font-size;
	 	font-size: $size * 1rem;
	}
	@else {
	  @warn "Please make sure `$size` is unitless."
	}
}
@mixin em($size) {	
	@if unitless($size) {
		$bf: $base-font-size / 1px;
	 	font-size: $size / $bf * 1em;
	}
	@else {
	  @warn "Please make sure `$size` is unitless."
	}
}
@mixin px($size) {	
	@if unitless($size) {
		$bf: $base-font-size / 1px;
	 	font-size: $size * $bf * 1px;
	}
	@else {
	  @warn "Please make sure `$size` is unitless."
	}
}