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Full list of @mixin in Bootstrap 4
Error: no mixin named box-shadow · Issue #597 · thomaspark/bootswatch · GitHub
Bootstrap on Twitter: "We'll be bringing CSS variables to more components in each minor v5 release to make customization easier and even reduce file size in some cases. Consider this before and
Sass] Mixin for inside borders. A way to add an border/outline to an… | by Ricardo Zea | Medium
Bootstrap shadows / Material Design shadows - examples & tutorial