diff --git a/README.md b/README.md
index ccacee8..480fd8e 100644
--- a/README.md
+++ b/README.md
@@ -63,7 +63,24 @@ Run experimental planning flow (only agent `Humanus` as executor):
 ```
 
 ## Acknowledgement
-<p align="center">
-  <img src="assets/whu.png" height="120"/>
-  <img src="assets/myth.png" height="120"/>
-</p>
+<!DOCTYPE html>
+<html>
+<head>
+    <style>
+        .center-images {
+            display: flex;
+            justify-content: center;
+            align-items: center;
+        }
+        .image {
+            margin: 030px;
+        }
+    </style>
+</head>
+<body>
+    <div class="center-images">
+        <img class="image" src="assets/whu.png" height="120"/>
+        <img class="image" src="assets/myth.png" height="120"/>
+    </div>
+</body>
+</html>
\ No newline at end of file
