diff --git a/assets/images/how-browser-works.png b/assets/images/how-browser-works.png
new file mode 100644
index 0000000..1e0089d
Binary files /dev/null and b/assets/images/how-browser-works.png differ
diff --git a/assets/images/http-flow.jpg b/assets/images/http-flow.jpg
new file mode 100644
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diff --git a/categories/web.md b/categories/web.md
index 4412380..5b97457 100644
--- a/categories/web.md
+++ b/categories/web.md
@@ -4,7 +4,7 @@
 - [HTTP 2](#http-2)
     - [HTTP server push](#http-server-push)
 - [HTTP server-sent events](#http-server-sent-events)
-        - [Links](#links)
+    - [Links](#links)
 - [CSS3](#css3)
 - [CORS](#cors)
 - [CDN](#cdn)
@@ -84,10 +84,10 @@ Frames:
 ## How browser works?
 
 * How browser render web page
-[how browser render web page](https://raw.githubusercontent.com/wahyd4/knowledge-mind-mapping/master/assets/images/how-browser-works.png)
+![how browser render web page](https://raw.githubusercontent.com/wahyd4/knowledge-mind-mapping/master/assets/images/how-browser-works.png)
 
 * The flow diagram when you access a website
-[Flow](https://raw.githubusercontent.com/wahyd4/knowledge-mind-mapping/master/assets/images/http-flow.png)
+![Flow](https://raw.githubusercontent.com/wahyd4/knowledge-mind-mapping/master/assets/images/http-flow.jpg)
 # CSS
 
 - tips