Update index.html

Author: arcxingye

r18/index.html

@@ -112,7 +112,7 @@
             display: flex;
             align-items: center;
             justify-content: center;
-            background-image: url(https://iw233.cn/API/mp.php);
+            background-image: url(https://iw233.cn/api.php?sort=mp);
             background-repeat: no-repeat;
             background-size: cover;
             background-position: center 0;