Answers for "Which CSS property is used to specify how much space should appear between the content of an element and its border?"

css padding

padding: 5px 10px 15px 20px; //top right bottom left

padding: 10px 20px;//top & bottom then left & right

padding-top: 5px; //just top padding
padding-right: 10px; //just right padding
padding-bottom: 15px; //just bottom padding
padding-left: 20px; //just left padding

css padding

padding: 5px 10px 15px 20px; //top right bottom left

padding: 10px 20px;//top & bottom then left & right

padding-top: 5px; //just top padding
padding-right: 10px; //just right padding
padding-bottom: 15px; //just bottom padding
padding-left: 20px; //just left padding