What do margin:5px 0; and margin:5px 0 0; mean?
According to Box Model: If there is only one value, it applies to all sides. If there are two values, the top and bottom margins are set to the first value and the right andleft margins are set to the second. If there are three values, the top is set to the first value, the left and right are set to the second, and the bottom is set to […]