diff --git a/src/ZB.MOM.WW.MxGateway.Server/ZB.MOM.WW.MxGateway.Server.csproj b/src/ZB.MOM.WW.MxGateway.Server/ZB.MOM.WW.MxGateway.Server.csproj
index a402153..8d299d8 100644
--- a/src/ZB.MOM.WW.MxGateway.Server/ZB.MOM.WW.MxGateway.Server.csproj
+++ b/src/ZB.MOM.WW.MxGateway.Server/ZB.MOM.WW.MxGateway.Server.csproj
@@ -15,7 +15,7 @@
     <PackageReference Include="ZB.MOM.WW.Auth.ApiKeys" Version="0.1.5" />
     <PackageReference Include="ZB.MOM.WW.Auth.AspNetCore" Version="0.1.5" />
     <PackageReference Include="ZB.MOM.WW.Audit" Version="0.1.0" />
-    <PackageReference Include="ZB.MOM.WW.Theme" Version="0.3.1" />
+    <PackageReference Include="ZB.MOM.WW.Theme" Version="0.4.1" />
     <PackageReference Include="ZB.MOM.WW.Configuration" Version="0.1.0" />
     <PackageReference Include="ZB.MOM.WW.Health" Version="0.2.0" />
     <PackageReference Include="ZB.MOM.WW.Telemetry" Version="0.1.0" />
diff --git a/src/ZB.MOM.WW.MxGateway.Server/wwwroot/css/site.css b/src/ZB.MOM.WW.MxGateway.Server/wwwroot/css/site.css
index 40542db..fa82bbd 100644
--- a/src/ZB.MOM.WW.MxGateway.Server/wwwroot/css/site.css
+++ b/src/ZB.MOM.WW.MxGateway.Server/wwwroot/css/site.css
@@ -183,8 +183,19 @@ code {
 }
 
 /* ── Buttons ─────────────────────────────────────────────────────────────────
-   Flatten Bootstrap buttons onto the single accent + hairline palette. */
-.btn { border-radius: 5px; font-size: 0.82rem; font-weight: 500; white-space: nowrap; }
+   Flatten Bootstrap buttons onto the single accent + hairline palette.
+
+   Button *sizing* is not here: ZB.MOM.WW.Theme 0.4.0 upstreamed it into
+   layout.css as --bs-btn-* variable overrides, and ThemeHead emits that sheet
+   ahead of this one, so it applies without a local copy. Do not reintroduce a
+   local font-size on .btn — a literal at equal specificity beats Bootstrap's
+   `font-size: var(--bs-btn-font-size)` and flattens .btn-sm into a
+   padding-only difference across the whole app.
+
+   What remains is shape, not size, and is app-specific. border-radius stays a
+   literal rather than --bs-btn-border-radius so .btn-sm cannot shrink it; the
+   .btn-group seam rules outrank .btn, so groups still render seamed. */
+.btn { border-radius: 5px; font-weight: 500; white-space: nowrap; }
 .btn-primary {
   background: var(--accent);
   border-color: var(--accent);