NSMutableAttributedString * attributedString = [[NSMutableAttributedString alloc] initWithData: [htmlString dataUsingEncoding: NSUnicodeStringEncoding]
                                                                                           options: @{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType }
                                                                                documentAttributes: nil
                                                                                             error: nil];


    //Replace ALL fonts, without taking in account the different sizes, bold/italic => All the same
    [attributedString addAttribute: NSFontAttributeName
                             value: [NSFont fontWithName: @"NotoSansCJKjp-Regular" size:14.0]
                             range: NSMakeRange(0, [attributedString length])];

    [attributedString enumerateAttribute:NSForegroundColorAttributeName
                                 inRange:NSMakeRange(0, [attributedString length])
                                 options: kNilOptions
                              usingBlock:^(id  _Nullable value, NSRange range, BOOL * _Nonnull stop) {
        if ([value isKindOfClass:[UIColor class]]) { //There is a color, we can check also its value if needed, like replace only blue, etc.
            UIColor *newColor = [UIColor colorFromHexString: @"454545"];
            [attributedString addAttribute:NSForegroundColorAttributeName value:newColor range:range];
        }
    }];