KNACSS/sass/_01-base.scss

/* ----------------------------- */
/* == soft reset                 */
/* ----------------------------- */

/* switching to border-box model for all elements */
html {
	box-sizing: border-box;
}

* {
	box-sizing: inherit;
}

/* soft reset */
html,
body {
	margin: 0;
	padding: 0;
}

ul,
ol {
	padding-left: 2em;
}

ul.unstyled {
	list-style: none;
}

img {
	vertical-align: middle;
	border: 0;
}

/* height auto only for non SVG images */
img:not([src$=".svg"]) {
	height: auto;
}

blockquote,
figure {
	margin-left: 0;
	margin-right: 0;
}

audio,
canvas,
video {
	display: inline-block;
}

svg:not(:root) {
	overflow: hidden;
}

/* ----------------------------- */
/* == typography                 */
/* ----------------------------- */

html {
	
	/* set base font-size to equiv "10px", which is adapted to rem unit */
	font-size: 62.5%;
	
	/* IE9-IE11 math fixing. See http://bit.ly/1g4X0bX */
	/* thanks to @guardian, @victorbritopro and @eQRoeil */
	font-size: calc(1em * 0.625);
	
	/* disallow text zooming on orientation change (non standard property) */
	-webkit-text-size-adjust: 100%;
	    -ms-text-size-adjust: 100%;
}

body {
	
	/* set body font-size in em (1.4em equiv "14px") */
	font-size: ($base-font-size / 10px) + em;
	
	background-color: $base-background;
	color: $base-color;
	font-family: $font-stack-common;
	line-height: $line-height;
}

a {
	color: $base-color-link;
	&:hover, &:focus, &:active {
		color: $base-color-link-hover;
	}
}

/* font-sizing for content */
p,
.p-like,
ul,
ol,
dl,
blockquote,
pre,
td,
th,
label,
textarea,
caption,
details,
figure {
	margin-top: 0.75em;
	margin-bottom: 0;
	line-height: $line-height;
}

h1, .h1-like {
	font-size: $h1-size;
	font-family: $font-stack-headings;
}

h2, .h2-like {
	font-size: $h2-size;
	font-family: $font-stack-headings;
}

h3, .h3-like {
	font-size: $h3-size;
}

h4, .h4-like {
	font-size: $h4-size;
}

h5, .h5-like {
	font-size: $h5-size;
}

h6, .h6-like {
	font-size: $h6-size;
}

/* alternate font-sizing */
.smaller {
	font-size: 0.6em;
}

.small {
	font-size: 0.8em;
}

.big {
	font-size: 1.2em;
}

.bigger {
	font-size: 1.5em;
}

.biggest {
	font-size: 2em;
}

code,
pre,
samp,
kbd {
	/* IE fix */
	white-space: pre-line;
	white-space: pre-wrap;
	font-family: $font-stack-monospace;
	line-height: normal;
}

em,
.italic,
address,
cite,
dfn,
i,
var {
	font-style: italic;
}

strong,
.bold {
	font-weight: bold;
}

small,
sub,
sup {
	font-size: smaller;
}

/* ----------------------------- */
/* == hiding content             */
/* ----------------------------- */

/* hidden but not for assistance tools, Yahoo! method */
.visually-hidden {
	position: absolute !important;
	border: 0 !important;
	height: 1px !important;
	width: 1px !important;
	padding: 0 !important;
	overflow: hidden !important;
	clip: rect(1px, 1px, 1px, 1px) !important;
}

@media (max-width: $small-screen) {
	.no-small-screen {
		display: none;
	}
}

@media (min-width: $large-screen) {
	.no-large-screen {
		display: none;
	}
}

/* ----------------------------- */
/* == browsers consistency       */
/* ----------------------------- */

/* avoid top margins on first content element */
p,
.p-like,
ul,
ol,
dl,
blockquote,
pre,
h1,
.h1-like,
h2,
.h2-like,
h3,
.h3-like,
h4,
.h4-like,
h5,
.h5-like,
h6,
.h6-like {
	&:first-child {
		margin-top: 0;
	}
}

/* avoid margins on nested elements */
li p,
li .p-like,
li ul,
li ol {
	margin-top: 0;
	margin-bottom: 0;
}

/* max values */
img,
table,
td,
blockquote,
code,
pre,
textarea,
input,
video {
	max-width: 100%;
}

/* margin-bottom on tables */
table {
	margin-bottom: $medium-value; 
}