Because your boss has direct influence over your career, a positive relationship with your boss can positively impact you. When your boss experiences success, extending congratulations should be an appropriate gesture. Whether the occasion is personal or professional, send a short message to congratulate the boss when the circumstances arise. The message need not be fancy -- just enough to extend your well wishes.
Write a short note inside the blank card to congratulate your boss for a personal or professional achievement. For example, if your boss just got married or had a baby, you might write, "Dear Ms. Anderson, Congratulations on your recent marriage. I wish you much happiness in your new life." Sign your name to the card and place it on your boss' desk or "in basket."
Send a short e-mail to your boss to congratulate him for a personal or professional accomplishment. For example, if your boss just received a promotion, you might write, "Dear Mr. Peters, Congratulations on your recent promotion. Your hard work and dedication make this advancement well earned." Sign your name to the email and send it.
Write a casual note of well wishes to congratulate your boss more informally. For example, when your boss makes a successful presentation or conducts a strong meeting, write a brief note on a sheet of paper. For example, you might write, "Congratulations on the great presentation! Your hard work really showed!" Sign your name and leave the note on your boss' desk.