#tool-body .preview-container {
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f8f8f8;
  margin-top: 20px;
  border: 1px solid #eee;
  border-radius: 8px;
}
#tool-body .placeholder {
  color: #999;
  font-style: italic;
}
.theme-dark-mode #tool-body .preview-container {
  background: #333;
  border-color: #333;
}