diff --git a/default.css b/default.css
index ceef733..559d0a8 100644
--- a/default.css
+++ b/default.css
@@ -1,13 +1,13 @@
 /*
  * Default CSS Definitions for Lecture Note
- * (C)2009, 2010 by HIROSE, Yuuji [yuuji>a<gentei.org]
+ * (C)2009, 2010, 2018 by HIROSE, Yuuji [yuuji>a<gentei.org]
  * $HGid$
- * Last modified Wed Nov 21 07:55:26 2018 on firestorm
- * Update Count: 82
+ * Last modified Wed Nov 21 08:05:46 2018 on firestorm
+ * Update Count: 85
  */
 
-@screen {
-    em  {color: red; text-decoration: underline;}
+@media screen {
+  em  {color: red; text-decoration: underline;}
 }
 
 /*
diff --git a/ipass/query.rb b/ipass/query.rb
index 2610e4d..203e126 100755
--- a/ipass/query.rb
+++ b/ipass/query.rb
@@ -31,11 +31,13 @@
   exit 0
 end
 
-if sid == "" || namae == "" || course == "" then
-  if sid > "" || namae > "" || course > "" then
+sid_invalid = (/^c11.....?$/i !~ sid)
+
+if sid == "" || namae == "" || course == "" || sid_invalid then
+  if sid == "" || namae == "" || course == "" then
     puts("<p><em>全ての項目を埋めてください</em></p>")
   end
-  if sid > "" && /^c11.....?$/i !~ sid then
+  if sid_invalid then
     puts("<p><em>正しい学籍番号を入れてください</em></p>")
     sid=""
   end