col-md-4 col-md-offset-4

Here is the XS card container.

col-md-6 col-md-offset-3

Here is the S card container.

col-md-8 col-md-offset-2

Here is the M card container.

col-md-10 col-md-offset-1

Here is the L card container.

col-md-12

Here is the XL/Full card container.