message: fallback to avatar bg color
diff: @@ -66,7 +66,7 @@ limitations under the License.
  content: var(--avatar-letter);
  width: 16px;
  height: 16px;
  - background: var(--avatar-background); //set on parent by JS
  + background: var(--avatar-background), $avatar-bg-color;
  color: $avatar-initial-color;
  background-repeat: no-repeat;
  background-size: 16px;
  