diff --git a/core/layout/common.css b/core/layout/common.css
index 3c10102d..39cc20ee 100755
--- a/core/layout/common.css
+++ b/core/layout/common.css
@@ -1683,11 +1683,11 @@ th.col12 {
 }
 
 .captchaNum {
-	height: 6em;
+	height: 5em;
 }
 
 .captchaAlpha {
-	height: 4em;
+	height: 2em;
 }
 
 .captcha input[type='text'] {