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Placeholders
Placeholders to @extend: flex, grid, typography.
3 documented in src/placeholders.scss.
%flex-center
Flexbox Centering Placeholder for centering content both horizontally and vertically using flexbox.
%grid-center
Grid Centering Placeholder for centering content in a grid container.
%container
Responsive Container Placeholder for defining a responsive container: it is centered, and its max-width grows with the width class (mobile first: it fills the screen on the base).