diff --git a/content/stylesheet.css b/content/stylesheet.css
index 3769ca3a743..5411c182b4a 100644
--- a/content/stylesheet.css
+++ b/content/stylesheet.css
@@ -73,3 +73,10 @@ header.site {
   border-style: solid;
   border-width: 1px;
 }
+
+#main img {
+  display: block;
+  margin: auto;
+  max-width: min(500px, 90%);
+  padding: max(1%, 10px);
+}