block level element
Block-level elements occupy one line by default
Block-level element width and height, line height, and margins and padding are all controllable
Elements in the line
Inline elements are also called inline elements or inline elements. Inline elements and other elements are on a single line, and the height, line height, padding, and margins cannot be changed. The width is the width of its text or image, and it cannot be changed. Inline elements can only hold text or other inline elements.
padding can be set
margin is only available on the left and right sides, not on the top and bottom