#include <FastLED.h>
    #define LED_PIN     3
    #define NUM_LEDS    60
    CRGB leds[NUM_LEDS];
    int x = 0;
    void setup() {
      FastLED.addLeds<WS2812, LED_PIN, GRB>(leds, NUM_LEDS);

    }
    void loop() {
      leds[x] = CRGB(255, 0, 0);
      FastLED.show();
      delay(2);
      leds[x] = CRGB(0, 255, 0);
      FastLED.show();
      delay(2);
      leds[x] = CRGB(0, 0, 255);
      FastLED.show();
      delay(2);
      leds[x] = CRGB(255, 255, 255);
      FastLED.show();
      delay(10);
      leds[x] = CRGB(255, 75, 0);
      FastLED.show();
      delay(10);
      x = x + 1;
      if (x > NUM_LEDS -1){
        for (int i=0; i < NUM_LEDS; i++){
          leds[x] = CRGB(0, 0, 0);
          x = x - 1;
          }
        x = 0;
        }
    }