Apply .imageFeed img styles globally

web/skins/classic/css/base/skin.css

@@ -764,3 +764,13 @@ a.flip {
 }
 #shutdownButton i {
 }
+.imageFeed {
+  margin: 0 auto;
+  text-align: center;
+  vertical-align: middle;
+  position: relative;
+}
+.imageFeed img {
+  max-width: 100%;
+  max-height: 100%;
+}