@mixin mm_navbar_tabs_borders( $top, $bottom, $last, $first ) {
	.mm-navbars_#{$top} {
		.mm-navbar_tabs:not( :#{$last}-child ) {
			border-#{$bottom}-width: 1px;
			border-#{$bottom}-style: solid;
		}
		.mm-navbar__tab_selected {
			border-#{$bottom}: none;
			margin-#{$bottom}: -1px;
		}
		.mm-navbar_tabs:#{$first}-child .mm-navbar__tab_selected {
			border-#{$top}: none;
		}
	}
}