- (NSString *)stringWithConfigKey:(NSString *)key {
    // Set the Close button in light mode
    if([key isEqualToString:TMA_SK_MINIAPP_CloseButton]) {
        return [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"white_close-circle.png"];
    } else if([key isEqualToString:TMA_SK_MINIAPP_CloseButtonDark]) {
        return [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"dark_close-circle.png"];
    }
    return nil;
}