.classA {
  width: 180px;
  border 3px solid black;
  background-color: white;
  color: red;
  font-family: arial, helvetica sans-serif;
  font-size: 24px;
  padding: 20px;
}

.classB {
  width: 180px;
  border 3px dotted white;
  background-color: black;
  color: yellow;
  font-family: "Times New Roman", serif;
  font-size: 24px;
  padding: 20px;
}