diff --git a/theme/37c3/theme.json b/theme/37c3/theme.json
index 6ff131eea..54cd2774e 100644
--- a/theme/37c3/theme.json
+++ b/theme/37c3/theme.json
@@ -24,7 +24,7 @@
     "welcome-button-color": "#6800e7",
     "login-button-fg-color": "#aaaaaaff",
     "welcome-button-fg-color": "#aaaaaaff",
-    "verticals-width": "16px",
+    "verticals-width": "6px",
     "tab-border-color": "#6800e7",
     "timeline-border-radius": "0",
     "button-corner-radius": "0",