diff --git a/demo.html b/demo.html
index 17f80e2..4f3d667 100644
--- a/demo.html
+++ b/demo.html
@@ -161,27 +161,27 @@
 </head>
 <body>
     <div id="captcha-container">
-        <div id="verify-section">
-            <input type="checkbox" id="verify-checkbox">
-            <label for="verify-checkbox" id="captcha-label">I'm not a robot.</label>
-            <span id="loading-text">Verifying...</span>
-            <img id="check-mark" src="https://captcha.xyehr.cn/check-mark.svg" style="display: none; width: 30px; height: 30px;">
-            <p id="verification-text" style="display: none;">Verification successful</p>
-            <p id="error-message" style="color: red; display: none;">Please re-verify</p>
-        </div>
-        <div id="brand">
-            <img src="https://captcha.xyehr.cn/assets/logo.svg" alt="AIR Captcha Logo">
-            AIR Captcha
-        </div>
+    <div id="verify-section">
+        <input type="checkbox" id="verify-checkbox">
+        <label for="verify-checkbox" id="captcha-label">I'm not a robot</label>
+        <span id="loading-text">Verifying...</span>
+        <img id="check-mark" src="/assets/check-mark.svg" style="display: none; width: 30px; height: 30px;">
+        <p id="verification-text" style="display: none;">Verification successful</p>
+        <p id="error-message" style="color: red; display: none;">Please re-verify</p>
     </div>
-
-    <div id="math-captcha-modal">
-        <h3 id="math-captcha-title">Solve the Math Problem</h3>
-        <div id="math-captcha-question"></div>
-        <input type="text" id="math-captcha-input">
-        <button id="math-captcha-button">Verify</button>
-        <p id="math-captcha-error">Incorrect answer, please try again.</p>
+    <div id="brand">
+        <a href="https://github.com/Dev-Huang1/Air-Captcha"><img src="/assets/logo.svg" alt="AIR Captcha Logo"></a>
+        AIR Captcha v1
     </div>
+</div>
+
+<div id="math-captcha-modal">
+    <h3 id="math-captcha-title">Solve the Math Problem</h3>
+    <div id="math-captcha-question"></div>
+    <input type="number" id="math-captcha-input" min="0" max="99">
+    <button id="math-captcha-button">Verify</button>
+    <p id="math-captcha-error">Incorrect answer, please try again.</p>
+</div>
     
     <noscript>
         <style>
