diff --git a/mitmproxy/tools/web/static/app.css b/mitmproxy/tools/web/static/app.css
index 908f8243c..c52f01294 100644
--- a/mitmproxy/tools/web/static/app.css
+++ b/mitmproxy/tools/web/static/app.css
@@ -1,2 +1,2 @@
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 /*# sourceMappingURL=app.css.map */
diff --git a/web/src/css/header.less b/web/src/css/header.less
index 87c98580e..a94773d33 100644
--- a/web/src/css/header.less
+++ b/web/src/css/header.less
@@ -49,7 +49,7 @@ header {
     }
 
     > .btn.btn-sm {
-        height: (@menu-height - @menu-legend-height)/3;
+        height: ((@menu-height - @menu-legend-height) / 3);
         padding: 0 5px;
         i {
             display: inline-block;
@@ -61,7 +61,7 @@ header {
 
 .menu-entry {
     text-align: left;
-    height: (@menu-height - @menu-legend-height)/3;
+    height: ((@menu-height - @menu-legend-height) / 3);
     line-height: 1;
     padding: 0.5rem 1rem;