diff --git a/scss/mixins/_buttons.scss b/scss/mixins/_buttons.scss
index e356c7928fa4..3e1e2c09d059 100644
--- a/scss/mixins/_buttons.scss
+++ b/scss/mixins/_buttons.scss
@@ -19,9 +19,9 @@
   &.focus {
     // Avoid using mixin so we can pass custom focus shadow properly
     @if $enable-shadows {
-      box-shadow: $btn-box-shadow, 0 0 0 $btn-focus-width rgba($border, .5);
+      box-shadow: $btn-box-shadow, 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5);
     } @else {
-      box-shadow: 0 0 0 $btn-focus-width rgba($border, .5);
+      box-shadow: 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5);
     }
   }
 
@@ -50,9 +50,9 @@
     &:focus {
       // Avoid using mixin so we can pass custom focus shadow properly
       @if $enable-shadows {
-        box-shadow: $btn-active-box-shadow, 0 0 0 $btn-focus-width rgba($border, .5);
+        box-shadow: $btn-active-box-shadow, 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5);
       } @else {
-        box-shadow: 0 0 0 $btn-focus-width rgba($border, .5);
+        box-shadow: 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5);
       }
     }
   }