背境框边如何透明, 我做不到

在 Yahoo Blog 將白色邊框轉透明的方法如下：
在『自己BLOG』按「編輯版面工具」再按「外觀」，

選《完全自定模式》到下一步，

在『自定CSS』輸入語法；再按『完成』就可以了。
語法~
.rc div{background: none;}
.rc_ft div{background: none;}
.rc_bd div.rc_bc{background: none;}
.rc_bd{background: none;}
.rc{background: none;}
.rc_ft{background: none;}
#blast .rc_ft{background: none;}
#blast .rc_ft div{background: none;}
#friendlist_module .rc div{background: none;}
#friendlist_module .rc_bc{background: none;}
#friendlist_module .rc_ft div{background: none;}
#friendlist_module .rc_bd{background: none;}
#friendlist_module .rc{background: none;}
#friendlist_module .rc_ft{background: none;}
#mod-friend-list-all .rc_bc{background: none;}
#mod-friend-list-all .rc div{background: none;}
#mod-friend-list-all .rc_bd{background: none;}
#mod-friend-list-all .rc{background: none;}
#mod-friend-list-all .rc_ft div{background: none;}
#mod-friend-list-all .rc_ft{background: none;}
#subscribe_highlight .rc {background: none;}
#subscribe_highlight .rc div{background: none;}
#subscribe_highlight .rc_bc {background: none;}
#subscribe_highlight .rc_bd {background: none;}
#subscribe_highlight .rc_ft {background: none;}
#subscribe_highlight .rc_ft div{background: none;}
#mod-tagged-frd-article .rc {background: none;}
#mod-tagged-frd-article .rc div{background: none;}
#mod-tagged-frd-article .rc_bc {background: none;}
#mod-tagged-frd-article .rc_bd {background: none;}
#mod-tagged-frd-article .rc_ft {background: none;}
#mod-tagged-frd-article .rc_ft div{background: none;}