.audi {
  border-radius: 5px;
  border: 3px solid #000000;
  background-color: #000044;
  color: white;
  padding: 8px 20px;
  text-align: center;
  font-size: 16px;
  margin: 4px 2px;
  text-decoration: none;
  display: inline-block;
  opacity: 1.0;
  transition: 0.3s;
}
.audi:hover {
  background-color: #ffffff;
  color: #000044;
  border-radius: 20px;
}
.bmw {
  border-radius: 5px;
  border: 3px solid #000000;
  background-color: #0000aa;
  color: white;
  padding: 8px 20px;
  text-align: center;
  font-size: 16px;
  margin: 4px 2px;
  text-decoration: none;
  display: inline-block;
  opacity: 1.0;
  transition: 0.3s;
}
.bmw:hover {
  background-color: #ffffff;
  color: #0000aa;
  border-radius: 20px;
}