/*
Mixin's
*/
.calc ( @prop , @percent: 100%  , @diff: 0px ) {
	@{prop} : calc( @percent ~'+' @diff );
}

.center ( @prop , @container , @child ) {
    @{prop}: ( @container/2 - @child/2 );
}

._handover ( @bg-color: #eee ) {
	.hand();
	
	&:hover {
		background-color: @bg-color;
	}
}