[website] Fix css style for 'code' in list (apache#1949)

Author: gyang94

website/src/css/custom.css

@@ -138,15 +138,13 @@
       }
     }
 
-    li {
-        code {
-            border-radius: 4px;
-            background-color: #edf2fa;
-            border: none;
-            padding: 3px 4px;
-            font-size: 14px;
-            color: #4c576c;
-        }
+    li > code {
+        border-radius: 4px;
+        background-color: #edf2fa;
+        border: none;
+        padding: 3px 4px;
+        font-size: 14px;
+        color: #4c576c;
     }
 
 /*    pre {