.close-x-button {
  position: fixed;
  top: 1rem;
  right: 1rem;
  background: rgba(255, 255, 255, 0.9);
  border: none;
  font-size: 1.5rem;
  color: #7f8c8d;
  cursor: pointer;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background-color 0.2s, color 0.2s;
  z-index: 1600;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.close-x-button:hover {
  background-color: #ffffff;
  color: #2c3e50;
}