Font is followed by the font size of 10px, followed by the name of the font.
The second one is that the background color is #fff
The third one is that the top margin is 0, and the left and right margins are adaptively centered
The fourth one is The row height is 1.4em
The fifth is that if the content is trimmed, the browser will display scroll bars to view the rest of the content.
width refers to the width of 100