fix size

src/client/styles/scss/_on-edit.scss

@@ -325,15 +325,9 @@ body.on-edit {
   }
 
   .grid-division-menu {
-    width: 1000px;
-    @include media-breakpoint-down(md) {
-      width: 650%;
-    }
-    @include media-breakpoint-down(sm) {
-      width: 300%;
-    }
-    @include media-breakpoint-down(xs) {
-      width: 200%;
+    width: 60vw;
+    @include media-breakpoint-down(lg) {
+      width: 80vw;
     }
   }
 }