   for (int16_t i=0; i<display.height(); i+=4) {
     display.drawLine(display.width()-1, 0, 0, i, WHITE);
     display.display();
+    delay(1);
   }
   for (int16_t i=0; i<display.width(); i+=4) {
     display.drawLine(display.width()-1, 0, i, display.height()-1, WHITE); 
     display.display();
+    delay(1);
   }
   delay(250);
 }

  for (int16_t i=0; i<display.width(); i+=4) {
    display.drawLine(0, 0, i, display.height()-1, WHITE);
    display.display();
  }
  for (int16_t i=0; i<display.height(); i+=4) {
    display.drawLine(0, 0, display.width()-1, i, WHITE);
    display.display();
  }
  delay(250);
  

  for (int16_t i=0; i<display.width(); i+=4) {
    display.drawLine(0, display.height()-1, i, 0, WHITE);
    display.display();
    delay(1);
  }
  for (int16_t i=display.height()-1; i>=0; i-=4) {
    display.drawLine(0, display.height()-1, display.width()-1, i, WHITE);
    display.display();
    delay(1);
  }
  delay(250);
  
