Arduino RGB controller

#define potent_pin 0

int pin_red = 6;
int pin_green = 10;
int pin_blue = 3;
int beeper = 9;

uint8_t red_bright = 255;
uint8_t green_bright = 255;
uint8_t blue_bright = 255;
uint8_t count = 1;
uint8_t rgb_state = 1;

void setup() {
  Serial.begin(9600);

  pinMode(pin_red, OUTPUT);
  pinMode(pin_green, OUTPUT);
  pinMode(pin_blue, OUTPUT);
  pinMode(beeper, OUTPUT);
  pinMode(7, INPUT_PULLUP);
}

bool flag = false;

void loop() {
  btn();
  potent();
  rgb_led();
  Serial.println(rgb_state);

  if (flag == true) {
    analogWrite(beeper, 250);
  }
  else{
    analogWrite(beeper, 0);
  }
  delay(5);
}

void btn(){
  bool btnState = !digitalRead(7);
  if (btnState && !flag) {
    flag = true;
    rgb_state++;
    if (rgb_state > 3){
      rgb_state = 1;
    }

  }
  if (!btnState && flag){
    flag = false;
  }
}

void potent(){
  count = map(analogRead(potent_pin),0,1023,0,255);
  switch(rgb_state) {
    case 1:
      red_bright = count;
    case 2:
      green_bright = count;
    case 3:
      blue_bright = count;

  }
}

void rgb_led(){
  analogWrite(pin_red, red_bright);
  analogWrite(pin_green, green_bright);
  analogWrite(pin_blue, blue_bright);
}