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How to change html text font size in uiwebview

In my application I am loading HTML String which is coming from server, the string already contain font color and font size but I need to change the color and size of the font. To replace that I have already use the followings code but its not working.

 UIWebView *webView=[[UIWebView alloc]initWithFrame:CGRectMake(0,0, 550, 200)];
 [webView loadHTMLString:[NSString stringWithFormat:@"<div style='text-align:justify; font-size:16px;font-family:HelveticaNeue-Condensed;color:#ffff;'>%@",title] baseURL:nil];
 [webView setOpaque:NO];
 webView.delegate = self;
 [webView setBackgroundColor:[UIColor clearColor]];
 [self addSubview:webView];

Is there is any other way to change it? Please suggest me the answer.

I used following code

      NSString *embedHTML = @"<html><body bgcolor=#EAEAEA><font face='Myriad Pro' size='3'><meta name='viewport' content='width=device-width; initial-scale=1.0; maximum-scale=5.0; user-scalable=YES'/>";///You can set your colour using font tag
      NSString *endHtml=@"</font></body></html>";
      NSString *strDes=[NSString stringWithFormat:@"%@%@%@",embedHTML,videoShareObject.strDescription,endHtml];
      [self.webViewObj loadHTMLString:strDes baseURL:nil];
      NSString *string = [NSString stringWithFormat:@"document.body.style.zoom = %f;", fontSizeSlider.value]; //I used the Sliderbar, You can set your font size.
      [webViewObj stringByEvaluatingJavaScriptFromString:string];

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