diff --git a/Viewer/css/experimenting.css b/Viewer/css/experimenting.css
index fed99584..ae8762bd 100755
--- a/Viewer/css/experimenting.css
+++ b/Viewer/css/experimenting.css
@@ -570,6 +570,23 @@ body {
 }
 
 
+/* image gaps */
+.image:not(:first-of-type) {
+	margin-left: var(--image-gap-size);
+}
+/* image gap indicator */
+.image:before {
+	content: var(--image-gap-text);
+	display: block;
+	position: absolute;
+	bottom: 0.5em;
+	left: 0px;
+	background:gray;
+	border-radius: 1em;
+	padding: 0.2em 0.5em;
+	transform: translate(-50%);
+} 
+
 
 /* DEBUG stuff... */
 .container-center {
diff --git a/Viewer/css/layout.css b/Viewer/css/layout.css
index 4d0a071a..1480db9a 100755
--- a/Viewer/css/layout.css
+++ b/Viewer/css/layout.css
@@ -42,6 +42,10 @@
 	--background-color: white;
 }
 
+.viewer.single-image-mode {
+	--ribbon-background-color: none;
+}
+
 
 
 /********************************************************* utility ***/