Instead of specifying an element's padding-top, padding-right, padding-bottom, and padding-left attributes, you can specify them all in one line, like this: padding: 10px 20px 10px 20px;.
These four values work like a clock: top, right, bottom, left, and will produce the exact same result as using the side-specific padding instructions.
.green-box {
background-color: green;
padding: 40px 20px 20px 40px
}