Identify the Word In The Missing Space

It’s that time of the day — again! (*whistles and party popper*) Smart Brains, here’s today’s puzzle to pump your brain muscles. Can you solve it? Share your answers now!

Answer : 

Red or Tan. Look at the number of letters in the boxes. They are gradually reducing on the way to the top. So the top box should contain the name of a color with 3 letters.