Layered box-shadows via Sass mixin
box-shadow()` mixin: allow 'null' and drop support 'none' with multiple args by ysds · Pull Request #30394 · twbs/bootstrap · GitHub
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Sass compiler throws 'undefined mixin' error when mixins are kept in seperate folder - Stack Overflow
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Sass-Mixins/mixins.scss at master · drublic/Sass-Mixins · GitHub
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GitHub - NikFlip/transition-mixin: This sass mixin gives you more control about the transition property
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claymorphism-css - npm
How to Use Mixins in Sass and Pass Arguments – With Code Examples
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Stir up Your Own Delicious Sass Mixins
sass - Compass "box-shadow" mixin returns Invalid property value - Stack Overflow
