&:focus {\n        @include box-shadow($btn-focus-box-shadow, $btn-active-box-shadow);\n      }\n    }\n  }\n}\n\n// Future-proof disabling of clicks on `<a>` elements\na.btn.disabled,\nfieldset:disabled a.btn {\n  pointer-events: none;\n}\n\n\n//\n// Alternate buttons\n//\n\n@each $color, $value in $theme-colors {\n  .btn-#{$color} {\n    @include button-variant($value, $value);\n  }\n}\n\n@each $color, $value in $theme-colors {\n  .btn-outline-#{$color} {\n    @include button-outline-variant($value);\n...