CSS has two type of element. class Class starts with period(.) in css format Class likes this format /* Style the element with the id "myHeader" */ #myHeader { background-color: lightblue; color: black; padding: 40px; text-align: center; } id id starts with sharp(#) in css format Id likes this format /* Style all elements with the class name "city" */ .city { background-color: tomato; color: whi..