diff --git a/themes/chameleon/scripts/copy-button.js b/themes/chameleon/scripts/copy-button.js
index 24484d4..e2e48bc 100644
--- a/themes/chameleon/scripts/copy-button.js
+++ b/themes/chameleon/scripts/copy-button.js
@@ -9,7 +9,7 @@ hexo.extend.filter.register('after_render:html', (data) => {
   const copyBtn = '<button class="copy-button">Copy</button>'
 
   // Regex is based on https://github.com/hexojs/hexo/pull/3697
-  return data.replace(/<pre>(?!<\/pre>).+?<\/pre>/ig, (str) => {
+  return data.replace(/<pre>(?!<\/pre>).+?<\/pre>/gs, (str) => {
     if (!str.includes(copyBtn)) return str.replace('</pre>', copyBtn + '</pre>')
     return str
   })