Change font color depending on value of variable

Hi all, I’m working on a hot tub web-thermometer and I need your help.
In my project I have 2 ds18b20 and I want to set the color of the font depending on the values of these sensors, is there a possiblility to “embed” a variablevalue into my code (see line 7 in the code)
If I write for instance green after color: (‘color:green’) it works fine.

String FontColor;
  if (sensors.getTempCByIndex(0)< 20.5) {FontColor="blue";}
  else {FontColor="green";}
  // Prepare the response
  String s = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<!DOCTYPE HTML>\r\n<html>\r\nTemp1: ";
  s += "<b>\n";
  s +="<font style='color:(FontColor)'>";
  s += (Temp1);
  s += "</font>";
  s += "</b>\n";
  s += "
  s += "\r\nTemp2: ";
  s += (Temp2);
  s += "</html>\n";
  // Send the response to the client

Best regards Mats

Hello and welcome.

You can do something like this:

s +="<font style='color:" + FontColor + "'>";

Thanks, that was exactly what I was looking for, thank you very much.

Br Mats