The order of padding is clockwise, up-->right-->down-->left
padding: 10px; all four paddings are 10px padding: 5px 10px; top and bottom 5px left and right 10px padding: 5px 10px 15px; top 5px right 10px bottom 15px left because the default is equal to the right, it is 10px padding: 5px 10px 15px 20px; top 5px right 10px bottom 15px left 20px