Every page layout should fit into and utilize the common grid strategy.
The grid consists of several key parts that include the Container, Container Margins, Columns, and Gutters.
All columns reside within the Container, which is located at the root level of a page. Depending on the breakpoint, the container will have Container Margins of various sizes. The container also has a maximum width property, beyond which only the container margins grow in size.
The container is divided into 12 proportional Columns which are used to size content and containers on the page. These are separated by Gutters of a fixed size (which varies based on the breakpoint again).
See the redlines for the exact dimensions of each feature at each breakpoint.