What color is the red on the keyboard of Lenovo notebook sl4 10k in the middle of GHB?

Hello, that's the patented technology of THINKPAD, commonly known as Little Red Riding Hood. Its functions are:

Press and hold the TrackPoint red little red riding hood and push it in the direction you want, or slide your finger in the direction you want on the touchpad to move the cursor.

The function of the left and right keys under the space bar and touchpad is similar to that of the left and right keys of the mouse.

I hope it helps you, and I wish you a happy life.