.copy-code-button {
  position: absolute;
  top: 8px;
  right: 12px;
  z-index: 3;
  background: #f8f9fa;
  border: 1px solid #ccc;
  border-radius: 3px;
  padding: 2px 8px;
  font-size: 12px;
  opacity: 0.75;
  transition: opacity 0.2s;
}
.copy-code-button:hover { opacity: 1; }