Grove lcd 16x2 lcd rgb backlight dosent work

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#1

I have a seeeduino lotus with this code. #include <SensirionI2CSht4x.h>
#include <Wire.h>
#include “rgb_lcd.h”

const int ledPin = 5;
const int buttonPin = 6;
int buttonState = 0;

SensirionI2CSht4x sht4x;
rgb_lcd lcd;

void setup() {

pinMode(ledPin, OUTPUT);
pinMode(buttonPin, INPUT);
Serial.begin(115200);
lcd.begin(16,2);
//initializes the I2C communication
Wire.begin();
sht4x.begin(Wire);

}

void loop() {
buttonState = digitalRead(buttonPin);
float temperature;
float humidity;
float limitTemp = 10.0;
float limitHumi = 50.0;

  //reads the temperature and humidity values from the sensor over the I2C connection
  uint16_t error = sht4x.measureHighPrecision(temperature, humidity);
if (buttonState == HIGH)
  { 
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.setCursor(0,1);
  lcd.print("Humi: ");
  lcd.print(humidity); 
  delay(3000);
  lcd.clear();
  
}
if (temperature >= limitTemp || humidity >= limitHumi) {      
  lcd.clear();
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.setCursor(0,1);
  lcd.print("Humi: ");
  lcd.print(humidity); 
  int colorR = 255;
  int colorG = 0;
  int colorB = 0;
  lcd.setRGB(colorR,colorG,colorB);

   
  }

     
}

when the temperature changes to above 10 (which is just to test, it will be much higher later) but still it dosent change colour.
#2

From your code it looks like the color will turn red when the temperature and humidity go beyond a certain level. But what is the color supposed to be in normal condition? Where did you define the color prior to the last line of your code?