In the video, a person is seen writing on a piece of cardboard with a green marker. The person writes the word "mail" and then proceeds to write a mathematical equation next to it. The equation is "40/4=10". The person writes the equation in a neat and legible manner. The cardboard provides a contrasting background to the green marker, making the writing stand out clearly. The video is shot from a close-up angle, focusing on the person's hand and the writing.