diff --git a/sass/_extra.scss b/sass/_extra.scss
index 5e6786d1d..e35d8ad52 100644
--- a/sass/_extra.scss
+++ b/sass/_extra.scss
@@ -63,7 +63,8 @@ h6:hover .anchor {
 
 .post-content p img {
     display: block;
+    box-sizing: border-box;
     margin: 16px auto;
     padding: 8px;
     border: 1px solid #e8e8e8;
-}
\ No newline at end of file
+}