Server messages clearly marked as such.

distro-packages/Arch-Linux/skald-git/PKGBUILD

@@ -2,7 +2,7 @@
 # shellcheck shell=bash disable=SC2034,SC2154
 
 pkgname=skald-git
-pkgver=0.0.0.r1535.g0a149e5
+pkgver=0.0.0.r1536.ga35ae10
 pkgrel=1
 pkgdesc='Audio-only hall-based conferencing server'
 arch=('x86_64' 'aarch64')

static/skald.js

@@ -2946,7 +2946,7 @@ function displayCaption(message) {
  * @param {string|HTMLElement} message
  */
 function localMessage(message) {
-    return addToChatbox(null, null, null, null, new Date(), false, false, '', message);
+    return addToChatbox(null, null, null, 'server', new Date(), false, false, '', message);
 }
 
 /**