pre {
  position: relative;
}

.copy-code-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  padding: 0.3rem 0.45rem;
  font-size: 0.85rem;
  line-height: 1;
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 3px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.copy-code-btn:hover {
  background: rgba(255, 255, 255, 0.22);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.4);
}

.copy-code-btn.copied {
  color: #6fcf97;
  border-color: #6fcf97;
}