chromium/chrome/browser/resources/ash/settings/os_printing_page/cups_add_printer_dialog.html

<style include="settings-shared">
  #dialog [slot=body] {
    padding-inline-end: 0;
    padding-inline-start: 0;
  }
</style>

<cr-dialog id="dialog" close-text="$i18n{close}">
  <div slot="title">
    <slot name="dialog-title"></slot>
  </div>
  <div slot="body">
    <slot name="dialog-body"></slot>
  </div>
  <div slot="button-container">
    <slot name="dialog-buttons"></slot>
  </div>
</cr-dialog>