diff --git a/src/css/style.css b/src/css/style.css
index 829af4c4..e2bd1f23 100644
--- a/src/css/style.css
+++ b/src/css/style.css
@@ -394,6 +394,7 @@ header #back-button {
 
 #attachment-preview img {
   max-height: 60vh;
+  max-width: 100%;
 }
 
 #attachment-preview button {