diff --git a/extensions/odoo_theme/static/style.scss b/extensions/odoo_theme/static/style.scss
index 549ea30a3..01f368429 100644
--- a/extensions/odoo_theme/static/style.scss
+++ b/extensions/odoo_theme/static/style.scss
@@ -178,9 +178,10 @@ header {
 
 .o_side_nav {
     width: 100%;
-    height: 100%;
+    height: calc(100% - (#{$o-headers-mobile-height});
     overflow-y: auto;
     position: fixed;
+    top: $o-headers-mobile-height;
     left: -100%;
     @include o-transition(all, .3s);
     padding-left: $padding-s;