.container {
  width: 100%;
  position: relative;
  display: inline-block;
}

.button {
  margin-left: auto;
  margin-right: auto;
  font-size: 20px;
  width: 48px;
  height: 48px;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 50%;
  text-align: center;
  padding: 4px;
  background-color: #555;
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 300ms;
}

.container:hover .button {
  background-color: #333;
}

.list {
  display: none;
  opacity: 0;
  position: absolute;
  background-color: #333;
  width: calc(100% - 8px);
  z-index: 1;
  border-radius: 12px;
  overflow: hidden;
  border: 4px solid #333;
  transition: opacity 500ms;
}

.container:hover .list {
  display: block;
  opacity: 1;
}

.item {
  padding: 6px 4px;
  text-align: center;
  display: block;
  cursor: pointer;
  transition: background-color 300ms;
}

.item:hover {
  background-color: #555;
}