inst/reveal.js-3.2.0/css/theme/template/mixins.scss

@mixin vertical-gradient( $top, $bottom ) {
	background: $top;
	background: -moz-linear-gradient( top, $top 0%, $bottom 100% );
	background: -webkit-gradient( linear, left top, left bottom, color-stop(0%,$top), color-stop(100%,$bottom) );
	background: -webkit-linear-gradient( top, $top 0%, $bottom 100% );
	background: -o-linear-gradient( top, $top 0%, $bottom 100% );
	background: -ms-linear-gradient( top, $top 0%, $bottom 100% );
	background: linear-gradient( top, $top 0%, $bottom 100% );
}

@mixin horizontal-gradient( $top, $bottom ) {
	background: $top;
	background: -moz-linear-gradient( left, $top 0%, $bottom 100% );
	background: -webkit-gradient( linear, left top, right top, color-stop(0%,$top), color-stop(100%,$bottom) );
	background: -webkit-linear-gradient( left, $top 0%, $bottom 100% );
	background: -o-linear-gradient( left, $top 0%, $bottom 100% );
	background: -ms-linear-gradient( left, $top 0%, $bottom 100% );
	background: linear-gradient( left, $top 0%, $bottom 100% );
}

@mixin radial-gradient( $outer, $inner, $type: circle ) {
	background: $outer;
	background: -moz-radial-gradient( center, $type cover,  $inner 0%, $outer 100% );
	background: -webkit-gradient( radial, center center, 0px, center center, 100%, color-stop(0%,$inner), color-stop(100%,$outer) );
	background: -webkit-radial-gradient( center, $type cover,  $inner 0%, $outer 100% );
	background: -o-radial-gradient( center, $type cover,  $inner 0%, $outer 100% );
	background: -ms-radial-gradient( center, $type cover,  $inner 0%, $outer 100% );
	background: radial-gradient( center, $type cover,  $inner 0%, $outer 100% );
}