iotaCSS is now a monorepo and all individual repositories are part of it. Please open issues or PRs here: https://github.com/iotacss/iotacss.
The push utility is responsible for handling grid's before offset.
npm install --save iotacss-utils-push
$iota-utils-push-namespace : 'push-' !default;
$iota-utils-push-delimiter : $iota-global-delimiter !default;
$iota-utils-push-columns : $iota-global-columns !default;
$iota-utils-push-res : false !default;
$iota-utils-push-breakpoints : $iota-global-breakpoints !default;.u-push-[column-number]/[total-columns-number] // Example: .u-push-1/3
// Responsive Classes Syntax
.u-push-[column-number]/[total-columns-number]@[breakpoint-name] // Example: .u-push-1/3@sm