add container class

[bariskrdrl]

It is used to create unlimited left and right containers.

uk-container-expand-right uk-container-expand-left

[BobbyBabes]

Also missing from the docs :

/* Item
 ========================================================================== */
/*
 * Utility classes to reset container padding on the left or right side
 * Note: It has to be negative margin on the item, because it's specific to the item.
 */
uk-container-item-padding-remove-left
uk-container-item-padding-remove-right