chromium/chrome/browser/resources/password_manager/credential_details/credential_note.html

<style include="cr-input-style cr-shared-style">
  #noteField {
    background: var(--cr-input-background-color);
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    padding: 10px 12px;
  }

  #noteValue {
    border: 0;
    color: var(--cr-input-color);
    flex: 1;
    opacity: var(--cr-input-readonly-opacity, 0.6);
    overflow: hidden;
    padding: 0;
    resize: none;
    text-overflow: ellipsis;
    white-space: pre-line;
  }

  #noteValue[limit-note] {
    max-height: 3lh;
  }

  #noteValue[empty] {
    color: var(--cr-input-placeholder-color, var(--cr-secondary-text-color));
    letter-spacing: var(--cr-input-placeholder-letter-spacing);
  }

  #showMore {
    color: var(--cr-link-color);
  }

  #noteValue,
  #showMore {
    font-family: inherit;
    letter-spacing: 0.15px;
    font-size: inherit;
  }

  .cr-form-field-label {
    margin-bottom: 8px;
  }

  #label {
    color: var(--cr-input-label-color);
    font-size: 11px;
    line-height: 16px;
}
</style>

<div id="label" class="cr-form-field-label">$i18n{noteLabel}</div>
<div id="noteField" class="input-field">
  <div id="noteValue" role="textbox" limit-note$="[[!showNoteFully_]]"
      empty$="[[noteIsEmpty_(note)]]">
    <span>[[getNoteValue_(note)]]</span>
  </div>
  <a id="showMore" href="/" on-click="onshowMoreClick_"
      hidden="[[isNoteFullyVisible_(showNoteFully_, note)]]">
    $i18n{showMore}
  </a>
</div>