Revert "make it wider (#1029)"

This reverts commit d6621d6643.

public/css/main.css

@@ -41,7 +41,7 @@ body {
 	border-bottom: 1px solid;
 }
 .container {
-	max-width: 1380px;
+	max-width: 1080px;
 	margin: 0 auto;
 }
 .content {
@@ -916,4 +916,4 @@ summary:after {
 details[open] summary:after {
 	content: "-";
 	margin: -4px 5px 0 0;
-}
+}