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Common breakpoints (mobile first)

These are guidelines, not strict rules. In general you should add a breakpoint whenever the design requires it, not whenever these guidelines say so.

Ems Px What happens above this breakpoint:
38em 608px Generic grids expand from single- to multi-column (anything below this is considered "Mobile")
40em 641px Comparison tables expand from single- to multi-column
48em 768px Mobile menu becomes desktop menu
55em 880px Layout grids expand from single- to multi-column
70em 1120px Column widths expand slightly (anything above this is considered "Desktop")