.unselectable() {
	-webkit-user-select: none;
	-moz-user-select: -moz-none;
	-ms-user-select: none;
	user-select: none;
}

// from https://stackoverflow.com/a/12178019/323407
.fade-out-vertical( @backgroundColor: white ) {
	@invisible: fadeout( @backgroundColor, 100% );
	background-image: linear-gradient( to bottom, @invisible 0%, @backgroundColor 100% ); // W3C
}

.fade-out-horizontal( @backgroundColor: white ) {
	@invisible: fadeout( @backgroundColor, 100% );
	background-image: linear-gradient( to right, @invisible 0%, @backgroundColor 100% ); // W3C
}

.rotate( @degrees: 45deg ) {
	transform: rotate( @degrees );
}

.grayscale() {
	/* stylelint-disable-next-line plugin/no-unsupported-browser-features */
	-webkit-filter: grayscale( 100% );
	/* stylelint-disable-next-line plugin/no-unsupported-browser-features */
	filter: grayscale( 100% );
}