body {
  height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.dropdown {
  position: relative;
  width: 200px;
}

.dropdown-button {
  width: 100%;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 5px;
  background-color: #fff;
  cursor: pointer;
  text-align: left;
}

.dropdown-button:after {
  content: "▼";
  float: right;
}

.dropdown-list {
  display: none;
  position: absolute;
  width: 100%;
  border: 1px solid #ccc;
  border-radius: 5px;
  background-color: #fff;
  margin-top: 5px;
  z-index: 1;
  list-style-type: none;
  padding: 0;
}

.dropdown-item {
  padding: 10px;
  cursor: pointer;
}

.dropdown-item:hover {
  background-color: #f0f0f0;
}

.dropdown-item.selected {
  background-color: #e0e0e0;
  font-weight: bold;
}

.dropdown.open .dropdown-list {
  display: block;
}

.dropdown.open .dropdown-button:after {
  content: "▲";
}