Give the div holding the main image a class name imageholder. In the style sheet do the following to present the image as shown:
- an outset border with the colour a the same rgba grey as the nav bar to let the page background show through but be darkened
- padding between the border and the image itself (not too much but some)
- a width the same as the image width
- margin left and right auto
The acronym has a title and they want a visual clue that it exists using an attribute selector. At least one browser will have done that for you but make sure by putting a 1px dashed bottom border under any abbr element with a title attribute using an attribute selector.