* {
  box-sizing: border-box;
}

html {
  font-size: 62.5%;
}

body {
  font-size: 1.6rem;
  margin: 0;
}

.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown .button {
  background-color: #f1f1f1;
  color: #333;
  min-width: 160px;
  padding: 16px;
  font-size: 1.6rem;
  text-align: center;
  border: none;
  cursor: pointer;
}

.dropdown .area {
  display: none;
  position: absolute;
  background-color: rgba(144, 238, 144, 0.5);
  min-width: 160px;
  min-height: 250px;
}

.dropdown .button:hover {
  background-color: #ddd;
}

.dropdown:hover .area {
  display: block;
}

.dropdown:hover .button {
  background-color: #ddd;
}