KNACSS/sass/_02-layout.scss

/* ----------------------------- */
/* ==layout and modules          */
/* ----------------------------- */

/* module, gains superpower "BFC" Block Formating Context */
.#{$kna-namespace}mod {
	overflow: hidden;
}

/* blocks that needs to be placed under floats */
.#{$kna-namespace}clear,
.#{$kna-namespace}line,
.#{$kna-namespace}row {
	clear: both;
}

/* blocks that must contain floats */
.#{$kna-namespace}clearfix,
.#{$kna-namespace}line {
	&::after {
		content: "";
		display: table;
		clear: both;
		border-collapse: collapse;
	}
}

/* simple blocks alignment */
.#{$kna-namespace}left {
	margin-right: auto;
}

.#{$kna-namespace}right {
	margin-left: auto;
}

.#{$kna-namespace}center {
	margin-left: auto;
	margin-right: auto;
}

/* text and contents alignment */
.#{$kna-namespace}txtleft {
	text-align: left;
}

.#{$kna-namespace}txtright {
	text-align: right;
}

.#{$kna-namespace}txtcenter {
	text-align: center;
}

/* floating elements */
.#{$kna-namespace}fl {
	float: left;
}

img.#{$kna-namespace}fl {
	margin-right: $small-value;
}

.#{$kna-namespace}fr {
	float: right;
}

img.#{$kna-namespace}fr {
	margin-left: $small-value;
}

img.#{$kna-namespace}fl,
img.#{$kna-namespace}fr {
	margin-bottom: $tiny-value;
}

/* table layout */
.#{$kna-namespace}row {
	display: table;
	table-layout: fixed;
	width: 100%;
}

.#{$kna-namespace}row > *,
.#{$kna-namespace}col {
	display: table-cell;
	vertical-align: top;
}

/* no table-cell for script tag when body is a .row */
body > script {
	display: none !important;
}

/* inline-block */
.#{$kna-namespace}inbl {
	display: inline-block;
	vertical-align: top;
}

/* flexbox layout
http://www.alsacreations.com/tuto/lire/1493-css3-flexbox-layout-module.html
*/

[class*="#{$kna-namespace}flex-container"] {
	display : flex;
	flex-wrap: wrap;
}

.#{$kna-namespace}flex-container-h {
	flex-direction: row;
}

.#{$kna-namespace}flex-container-v {
	flex-direction: column;
}

.#{$kna-namespace}flex-item-fluid {
	flex: 1;
}

.#{$kna-namespace}flex-item-first {
	order : -1;
}

.#{$kna-namespace}flex-item-medium {
	order : 0;
}

.#{$kna-namespace}flex-item-last {
	order : 1;
}

.#{$kna-namespace}flex-item-center {
	margin: auto;
}