Button shadow is hardcoded · Issue #24242 · twbs/bootstrap · GitHub
Stripe-style box shadow mixin
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Example of different style of box shadow usign bootstrap
12+ Bootstrap Box Shadow Examples - OnAirCode
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Disabling box shadows on buttons still renders box-shadows · Issue #32032 · twbs/bootstrap · GitHub
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Bootstrap box shadow - code helper
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Material Design Box Shadows
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12+ Bootstrap Box Shadow Examples - OnAirCode
Error: no mixin named box-shadow · Issue #597 · thomaspark/bootswatch · GitHub
12+ Bootstrap Box Shadow Examples - OnAirCode
