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&:-moz-focusring {\n    color: transparent;\n    text-shadow: 0 0 0 $input-color;\n  }\n\n  &:focus::-ms-value {\n    // Suppress the nested default white text on blue background highlight given to\n    // the selected option text when the (still closed) <select> receives focus\n    // in IE and (under certain conditions) Edge, as it looks bad and cannot be made to\n    // match the appearance of the native widget.\n    // See https://github.com/twbs/bootstrap/issues/19398.\n    color: $input-color;\n...