chromium/ash/webui/personalization_app/resources/js/ambient/zero_state_element.html

<style include="wallpaper common">
  :host {
    align-items: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    margin: 34px 0;
    overflow: hidden;
  }

  div {
    color: var(--cros-text-color-secondary);
    font: var(--cros-body-1-font);
    max-width: 236px;
    text-align: center;
  }

  img {
    width: 260px;
  }
</style>

<iron-media-query query="(prefers-color-scheme: dark)"
    query-matches="{{isDarkModeActive_}}">
</iron-media-query>
<img src="[[getImageSource_(isDarkModeActive_)]]" aria-hidden="true">
<div>$i18n{ambientModeZeroStateMessage}</div>