diff --git a/incorporealcms/static/css/plain.css b/incorporealcms/static/css/plain.css
index f02e3d8..f0f360b 100644
--- a/incorporealcms/static/css/plain.css
+++ b/incorporealcms/static/css/plain.css
@@ -10,3 +10,19 @@
 .img-75 {
     max-width: 75% !important;
 }
+
+.img-center {
+    display: block;
+    margin-left: auto;
+    margin-right: auto;
+}
+
+.img-left {
+    float: left;
+    margin-right: 1em;
+}
+
+.img-right {
+    float: right;
+    margin-left: 1em;
+}