<details>
  <summary>Show Retired things</summary>
  <button>Show retired things Tier1 </button>
  <button>Show retired things Tier2 </button>
  <button>Show retired things Tier3 </button>
</details>

summary,
button {
  padding: 0.5rem 1rem;
  border: 1px solid #000;
  border-radius: 10px;
  width: fit-content;
  background: linear-gradient(cyan, teal);
  color: #fff;
  cursor: pointer;
  margin: 0 0 0.5rem;
}
button {
  display: block;
}