This adds :root level CSS variables to all bundles, regardless of how many of them are used in that bundle. With v5.1.1, we standardized our required across all our CSS bundles (including bootstrap.css, bootstrap-reboot.css, and bootstrap-grid.css) to include _root.scss. Keep declarations of font-related properties to a minimum, using inherit whenever possible.For easier scaling across device sizes, block elements should use rems for margins.More importantly though, a single direction of margin is a simpler mental model. Vertical margins can collapse, yielding unexpected results. Update some browser default values to use rems instead of ems for scalable component spacing.Here are our guidelines and reasons for choosing what to override in Reboot: For example, we reboot some styles for a simpler baseline and later provide.
Additional styling is done only with classes.
Reboot builds upon Normalize, providing many HTML elements with somewhat opinionated styles using only element selectors.
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