diff --git a/index.html b/index.html
index 7823905..4428ff7 100644
--- a/index.html
+++ b/index.html
@@ -1,44 +1,44 @@
 <!doctype html>
 
 <head>
-	<meta charset="utf-8" />
-	<style>
-		footer {
-			display: flex;
-			flex-direction: column;
-			justify-content: center;
-			align-items:  center;
-			font-size: 20px;
-			position: absolute;
-			bottom: 0px;
-			left: 0px;
-			right: 0px;
-			background-color: #e4e4e4;
-			padding: 10px 0px;
-		}
-		
-		.filing-container {
-			width: 100%;
-			display: flex;
-			margin-top: 5px;
-			justify-content: center;
-			align-items: center;
-		}
-	</style>
+    <meta charset="utf-8"/>
+    <style>
+        footer {
+            display: flex;
+            flex-direction: column;
+            justify-content: center;
+            align-items: center;
+            font-size: 20px;
+            position: absolute;
+            bottom: 0px;
+            left: 0px;
+            right: 0px;
+            background-color: #e4e4e4;
+            padding: 10px 0px;
+        }
+
+        .filing-container {
+            width: 100%;
+            display: flex;
+            margin-top: 5px;
+            justify-content: center;
+            align-items: center;
+        }
+    </style>
 </head>
 
 <body>
-	<h1 style="text-align: center;">XiaoAi's website</h1>
+<h1 style="text-align: center;">XiaoAi's website</h1>
 
-	<footer>
-		<div class="filing-container">
-			<a href="https://beian.miit.gov.cn/" target="_blank">沪ICP备2026028815号-1</a>
-		</div>
+<footer>
+    <div class="filing-container">
+        <a href="https://beian.miit.gov.cn/" target="_blank">沪ICP备2026028815号-1</a>
+    </div>
 
-		<div class="filing-container" style="margin-top: 5px;">
-			<img src="./filing_icon.png" width="30px" height="30px"/>
-			<div style="width: 10px;"></div>
-			<a href="https://beian.mps.gov.cn/#/query/webSearch?code=31011702891982" rel="noreferrer" target="_blank">沪公网安备31011702891982号</a>
-		</div>
-	</footer>
+    <div class="filing-container" style="margin-top: 5px;">
+        <img src="./filing_icon.png" width="30px" height="30px"/>
+        <div style="width: 10px;"></div>
+        <a href="https://beian.mps.gov.cn/#/query/webSearch?code=31011702891982" rel="noreferrer" target="_blank">沪公网安备31011702891982号</a>
+    </div>
+</footer>
 </body>