width: 100%. With inline stack option you can have width:auto stack:
m-stack--general, m-stack--desktop,
m-stack--tablet, m-stack--desktop-and-tablet, m-stack--mobile, m-stack--tablet-and-mobile. When m-stack--general mode used the stack mode will remain but with other modes, for
example with m-stack--tablet the stack mode will be activate within the device width and outside the device with the stack will be have just normal block tag.
m-stack--general:
m-stack--desktop:
m-stack--tablet:
m-stack--mobile: