diff --git a/themes/red/assets/css/site.css b/themes/red/assets/css/site.css
index 8a04ceb..e50eddf 100644
--- a/themes/red/assets/css/site.css
+++ b/themes/red/assets/css/site.css
@@ -6,6 +6,10 @@
         "nav  main"
         "nav  foot";
     }
+
+    aside {
+        width: 250px;
+    }
 }
 
 /* mobile devices */
@@ -17,6 +21,10 @@
         "main"
         "foot";
     }
+
+    aside {
+        width: 100%;
+    }
 }
 
 body {
@@ -35,8 +43,6 @@ header {
 aside {
     background-color: white;
 
-    width: 250px;
-
     grid-area: nav;
 }