Ask for help. . . How to fully display the folding menu of the navigation bar_html/css_WEB-ITnose

As the title says, there is now a website with a header made of a frame. A folding menu is made in the navigation bar. When the mouse is moved up, it is displayed and left hidden. Now when the frame is referenced on the home page, the hidden menu is found. It cannot be displayed completely. The scroll bar begins to appear. After setting scrolling="no", the scroll bar disappears, but only half of the menu can be displayed. Please help. . . . Now we use Html JavaScript to do it,

Reply to the discussion (solution)

The situation is as shown in the picture. . .

Header introduced with iframe? Try setting the position of the head to make sure it is not covered.

Please help. . . . . . Here comes someone