When we study, the article occupies too little of the whole screen, about 3/16 are occupied by the menu bar, which very much affects the attention of reading, and at the same time in the aesthetic design point of view is also lacking. Suggest to give a movable, automatically shrinking In the process of reading and learning to try not to notice the existence of the menu, for example, the menu will be designed as apple note can be minimised in the same way, but need to be commonly used functions will be displayed, such as eraser, pen, fast page flip, or give the user some customization, so that the user to decide what can be displayed in the menu when minimized. Below is the implementation of my idea.