diff --git a/swc.css b/swc.css
index 59bab5a6f42fc83a0501997ada2cfdb2a364de45..cd7acb5053587b4175bc6c6ccc129b963f953600 100644
--- a/swc.css
+++ b/swc.css
@@ -122,6 +122,7 @@ div.box {
 @media (min-width: 700px) {
     div.box {
         width: 54em;
+        max-width: 80%;
     }
 }