.zx-html {
  min-width: 0;
}
.zx-html__placeholder {
  display: none;
}
/* Editor only: make an empty HTML block visible. */
body.zadex-preview .zx-html__placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  border: 1px dashed rgba(37, 99, 235, 0.4);
  border-radius: 4px;
  color: rgba(37, 99, 235, 0.7);
  font: 500 12px/1 -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, monospace;
}