fix header

@@ -28,17 +28,18 @@
 </script>
 <style>
     .header {
+        box-sizing: content-box;
         position: fixed;
         top: 0;
         right: 0;
         left: 0;
         z-index: 210;
-        padding-top: 5px;
-        padding-left: 30px;
-        padding-right: 30px;
-        width: 100%;
-        height: 80px;
-        line-height: 60px;
+        padding: 10px 30px;
+        height: 70px;
+        max-width: 750px;
+        margin-left: auto;
+        margin-right: auto;
+        line-height: 70px;
         font-size: 48px;
         background-color: #fff;
         .icon,
@@ -66,17 +67,16 @@
     }
 
     .header-gap {
-        height: 80px;
+        height: 90px;
         background-color: #fff;
     }
 
     .app.ios {
         .header {
-            padding-top: 55px;
+            padding-top: 50px;
         }
-
         .header-gap {
-            height: 120px;
+            height: calc(70 + 50+ 10)px;
         }
     }
 </style>

@@ -13,7 +13,7 @@
         word-wrap: break-word;
 
         img {
-            width: 100%;
+            max-width: 100%;
         }
 
         p {