返回按钮变大

@@ -16,10 +16,10 @@
             padding: 34px 30px 0;
 
             .back {
-                width: 40px;
-                height: 40px;
+                width: 60px;
+                height: 60px;
                 background-image: resolve("home/family/back.png");
-                background-size: 50% 100%;
+                background-size: 40% 70%;
                 background-repeat: no-repeat;
                 display: block;
                 float: left;