diff --git a/book.json b/book.json
index 63d7fd2..b282b57 100644
--- a/book.json
+++ b/book.json
@@ -26,7 +26,8 @@
         "search",
         "search-pro",
         "disqus",
-        "page-footer-ex"
+        "page-footer-ex",
+        "copy-code-button"
     ],
     "pluginsConfig": {
         "page-footer-ex": {
diff --git a/styles/website.css b/styles/website.css
index 5646ecc..7a48d53 100644
--- a/styles/website.css
+++ b/styles/website.css
@@ -16,3 +16,9 @@ li.chapter {
 .book-body {
     font-size: 1.5rem !important;
 }
+.copy-code-button {
+    display: none;
+}
+pre:hover > .copy-code-button {
+    display: block;
+}