_s/sass/mixins/_mixins-master.scss

// Rem output with px fallback
@mixin font-size($sizeValue: 1.6) {
	font-size: ($sizeValue * 10) + px;
	font-size: $sizeValue + rem;
}

// Box model
@mixin box-sizing($box-model) {
	-webkit-box-sizing: $box-model; // Safari <= 7
	-moz-box-sizing: $box-model; // Firefox <= 19
	box-sizing: $box-model;
}

// Center block
@mixin center-block {
	display: block;
	margin: 0 auto;
}

// Clearfix
@mixin clearfix() {
	content: "";
	display: table;
}

// Clear after (not all clearfix need this also)
@mixin clearfix-after() {
	clear: both;
}