diff --git a/routes/css.cpp b/routes/css.cpp
index 50aebe4..65ecaf1 100644
--- a/routes/css.cpp
+++ b/routes/css.cpp
@@ -28,8 +28,8 @@ static const constexpr char css[] = R"EOF(
         font-family: sans-serif;
     }
     img {
-        object-fit: cover;
         max-width: 100%;
+        height: auto; /* https://stackoverflow.com/a/17183996 */
     }
     .center {
         text-align: center;