diff --git a/default.css b/default.css
index f002b86..0831a5c 100644
--- a/default.css
+++ b/default.css
@@ -3,7 +3,7 @@ body {
     font-size: 14px;
     color: #4c4f69;
     line-height: 1.5;
-    max-width: 1920px;
+    max-width: 900px;
     margin-inline: auto;
     background: #eff1f5;
     margin: 0px auto;
@@ -56,10 +56,7 @@ canvas {
 }
 
 #main {
-    margin: 0px 120px;
-    @media (min-width: 1920px) {
-        display: flex;
-    }
+    margin: 0px auto;
 }
 
 .canvas {