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diff --git a/index.html b/index.html
index 52342293e..10b502621 100644
--- a/index.html
+++ b/index.html
@@ -265,7 +265,7 @@
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               动画图解、一键运行的数据结构与算法教程
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+            <a class="rounded-button" href="/chapter_hello_algo/">
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@@ -335,7 +335,7 @@
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-              <a href="/chapter_preface/">
+              <a href="/chapter_hello_algo/">
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