responsive-stub.less

/* declaration */
@size-tn: ~"(max-width: 479px)";
@size-xs: ~"(min-width: 480px) and (max-width: 767px)";
@size-sm: ~"(min-width: 768px) and (max-width: 991px)";
@size-md: ~"(min-width: 992px) and (max-width: 1199px)";
@size-lg: ~"(min-width: 1200px)";

/* example usage */
footer {
    @media @size-xs {
        // input
    }
    @media @size-md {
        // input
    }
    // ...
}