diff --git a/app/static/css/style.css b/app/static/css/style.css
index ed8b42e..e772c0a 100644
--- a/app/static/css/style.css
+++ b/app/static/css/style.css
@@ -123,6 +123,9 @@ video, .poster {
     padding: 4px;
     border-bottom: 1px solid blueviolet;
     display: none;
+    img {
+        max-width: 100%;
+    }
 }
 .annotation.active {
     display: block;