$_base-container-width: 700px;
$_base-item-width: 220px;
$_base-count-item-in-row: 3;

$_base-gap-width: ($_base-container-width - $_base-item-width * $_base-count-item-in-row) / ($_base-count-item-in-row - 1);
$_rezult-container-width: ($_base-container-width + $_base-gap-width);

$_container-offset: -($_base-gap-width / $_base-container-width) / 2  * 100%;
$_item-width: $_base-item-width / $_rezult-container-width  * 100%;
$_gap-width: ($_base-gap-width / $_rezult-container-width) / 2 * 100%;