diff --git a/themes/luci-theme-openwrt-2020/htdocs/luci-static/openwrt2020/cascade.css b/themes/luci-theme-openwrt-2020/htdocs/luci-static/openwrt2020/cascade.css
index 0dc06a0bd2..c6e5d77428 100644
--- a/themes/luci-theme-openwrt-2020/htdocs/luci-static/openwrt2020/cascade.css
+++ b/themes/luci-theme-openwrt-2020/htdocs/luci-static/openwrt2020/cascade.css
@@ -148,7 +148,8 @@ body {
 }
 
 #mainmenu {
-	flex: 1 1 200px;
+	flex: 1 1 100px;
+	max-width: 250px;
 	background: var(--main-dark-color);
 	color: var(--main-bright-color);
 	padding: 1em;