Proton
Grid
Proton's grid comprises twelve fluid columns with fixed, 20-pixel gutters. Each column is 8.333% of the total container width (100% รท 12).
The gutters are produced with padding on the columns; 10 pixels of
padding inside adjacent columns gives 20 pixels of space between
column contents. This only works in browsers that support
border-box and breaks horribly in older browsers with
the standard box model. This is unshippable.
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