[ticket/11962] Resize posted images to fit and give them a class

PHPBB3-11962

phpBB/styles/subsilver2/theme/stylesheet.css

@@ -627,6 +627,10 @@ input:focus, select:focus, textarea:focus {
 	background-color: #FAFAFA;
 }
 
+.postimage {
+	max-width: 99%;
+}
+
 .syntaxbg {
 	color: #FFFFFF;
 }