diff --git a/exercise/main.css b/exercise/main.css
deleted file mode 100644
index 337a8223380cd045275cb0c2021f09bc16d273c9..0000000000000000000000000000000000000000
--- a/exercise/main.css
+++ /dev/null
@@ -1,23 +0,0 @@
-.header{
-    /*璁剧疆瀹瑰櫒鐨勫ぇ灏忥紝鐒跺悗璁╁鍣ㄥ唴鐨勫浘鐗囦笉浼氳秴鍑哄幓*/
-    border-color: black;/*鍙鍖栬竟妗嗚寖鍥寸敤*/
-    border-style: solid;
-    width: 100%;
-    height: 120px;
-    overflow: hidden;
-    /*鍥剧墖瓒呭嚭瀹瑰櫒鐨勯儴鍒嗛殣钘忔帀  */
-    position: relative;
-   /*杩欎釜postion鏄敤浜庤鑼冿紝鍥犱负img鐨刪eader鐨勫瓙绫伙紝瀛愮被鐨刾osition鍐欑殑absolute鏄浉瀵逛簬鐖剁被鐨刟bsolute锛岃鑼冨啓娉曢渶瑕佸姞涓�*/
-
-
-}
-/*灏嗗浘鐗囨寜鐓у鍣ㄧ殑澶у皬杩涜閫傞厤锛岀粺涓€楂樺害骞跺眳涓�*/
-.header img{
-    height: 120px;
-   position: absolute;
-    /*璁剧疆鍥剧墖鏄粷瀵逛綅缃紝骞朵笖鏄粷瀵规槸浠庡鍣ㄧ殑宸︿竴鍗婄殑浣嶇疆寮€濮嬫樉绀�*/
-    left: 50%;
-    transform: translateX(-50%);
-    transform鏄Щ鍔ㄥ睘鎬э紝X杞寸Щ鍔�-50% 涔熷氨鏄悜宸︾Щ鍔ㄤ竴鍗婄殑璺濈锛岃繖鏍峰氨涓€瀹氭槸灞呬腑鏄剧ず鐨勫浘鐗�
-
-}
\ No newline at end of file