diff --git a/src/main/webapp/assets/common/css/gitbucket.css b/src/main/webapp/assets/common/css/gitbucket.css
index d16a746..ca0259d 100644
--- a/src/main/webapp/assets/common/css/gitbucket.css
+++ b/src/main/webapp/assets/common/css/gitbucket.css
@@ -1446,6 +1446,10 @@
   margin-top: 20px;
 }
 
+div.wiki-sidebar img {
+  max-width: 100%;
+}
+
 div.wiki-sidebar-dotted {
   background-color: white;
   border: 1px dashed #ddd;
@@ -1878,6 +1882,10 @@
   line-height: 1.5;
 }
 
+div.markdown-body img {
+  max-width: 100%;
+}
+
 div.markdown-body pre {
   font-family: Consolas, "Liberation Mono", Menlo, Courier, monospace;
   font-size: 12px;