box-shadow($btn-box-shadow, 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5));\n    } @else {\n      // Avoid using mixin so we can pass custom focus shadow properly\n      box-shadow: 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5);\n    }\n  }\n\n  // Disabled comes first so active can properly restyle\n  &.disabled,\n  &:disabled {\n    color: color-yiq($background);\n    background-color: $background;\n    border-color: $border;\n    // Remove CSS gradients...