body {
  margin-top: 200px;
}

ul {
  margin: 0 auto;
  max-width: 500px;
  width: 100%;
  list-style: none;
}

button {
  font-size: 2rem;
  width: 100%;
  cursor: pointer;
  border: 2px solid;
}

.collapse-container {
  font-size: 1rem;
}