diff --git a/CHANGELOG.md b/CHANGELOG.md
index 041911f..3f4717b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 ## Changelog
 
+### v0.167.1 — Center the sidebar logo (2026-07-24)
+
+CSS one-liner + test. `.sidebar-logo` gains `margin: 0 auto` so the 140px logo is horizontally
+centered within the header instead of left-aligned — applies to both the desktop sidebar and the
+mobile drawer (same element). Pin: `TestSidebarLogo_Centered` (red-proof verified).
+
 ### v0.167.0 — Outlined logo + favicon (Part 4, the v0.166.0 gated follow-up) (2026-07-24)
 
 No agent coupling; MinAgent unchanged. Embedded-asset constants + one test only — no backend, no
diff --git a/controller/internal/web/mobile_nav_test.go b/controller/internal/web/mobile_nav_test.go
index 57232fd..c05ccb0 100644
--- a/controller/internal/web/mobile_nav_test.go
+++ b/controller/internal/web/mobile_nav_test.go
@@ -88,6 +88,24 @@ func TestMobileCSS_StripRemovedDrawerPresent(t *testing.T) {
 	}
 }
 
+// The sidebar logo is horizontally centered in its header (desktop sidebar + mobile drawer share
+// the element). Red-proof: revert to `margin-bottom: 0.25rem` (no auto side-margins) → this FAILS.
+func TestSidebarLogo_Centered(t *testing.T) {
+	data, err := StyleCSS()
+	if err != nil {
+		t.Fatalf("StyleCSS(): %v", err)
+	}
+	css := string(data)
+	i := strings.Index(css, ".sidebar-logo {")
+	if i < 0 {
+		t.Fatal(".sidebar-logo rule not found")
+	}
+	rule := css[i : i+strings.Index(css[i:], "}")]
+	if !strings.Contains(rule, "margin: 0 auto") {
+		t.Errorf(".sidebar-logo is not centered (no `margin: 0 auto`); rule was:\n%s", rule)
+	}
+}
+
 // Group A — drawer markup (Scenario A/C), asserted through the real layout render.
 //
 // Red-proof: remove aria-controls from the burger button in layout.html → the aria-controls
diff --git a/controller/internal/web/templates/style.css b/controller/internal/web/templates/style.css
index ed069e8..74e85b8 100644
--- a/controller/internal/web/templates/style.css
+++ b/controller/internal/web/templates/style.css
@@ -92,7 +92,7 @@ body {
     width: 140px;
     height: auto;
     display: block;
-    margin-bottom: 0.25rem;
+    margin: 0 auto 0.25rem;
 }
 .login-logo {
     width: 200px;