diff --git a/totoga2/readable.html b/totoga2/readable.html
index d098aba..535ae5e 100644
--- a/totoga2/readable.html
+++ b/totoga2/readable.html
@@ -82,70 +82,60 @@
         .container11 {
             width: 100%;
             height: 100%;
-            background-color: lightpink;
         }
 
         .container21 {
             float: right;
             width: 50%;
             height: 100%;
-            background-color: lightblue;
         }
 
         .container22 {
             float: left;
             width: 50%;
             height: 100%;
-            background-color: lightyellow;
         }
 
         .container31 {
             float: left;
             width: 33%;
             height: 100%;
-            background-color: darkblue;
         }
 
         .container32 {
             float: left;
             width: 33%;
             height: 100%;
-            background-color: darkgreen;
         }
 
         .container33 {
             float: right;
             width: 33%;
             height: 100%;
-            background-color: darkmagenta;
         }
 
         .container41 {
             float: left;
             width: 25%;
             height: 100%;
-            background-color: lightblue;
         }
 
         .container42 {
             float: left;
             width: 25%;
             height: 100%;
-            background-color: lightgreen;
         }
 
         .container43 {
             float: right;
             width: 25%;
             height: 100%;
-            background-color: lightpink;
         }
 
         .container44 {
             float: right;
             width: 25%;
             height: 100%;
-            background-color: lightyellow;
         }
 
         /* 圖在欄寬內鋪滿，高度由瀏覽器依 intrinsic ratio 計算（須配合上方 :has(img) 拿掉固定列高） */