freeCodeCamp Challenge Guide: Adjusting the Padding of an Element

freeCodeCamp Challenge Guide: Adjusting the Padding of an Element
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#1

HTML elements are essentially little rectangles. Three important attributes control the space that surrounds each HTML element: padding, margin, and border. An element’s padding controls the amount of space between the element and its border.

.green-box {
  background-color: green;
  padding: 20px;
}

#2

this is hint , ?..