diff --git a/web/site/css/instances.css b/web/site/css/instances.css
index adb9342..343cf7b 100644
--- a/web/site/css/instances.css
+++ b/web/site/css/instances.css
@@ -427,6 +427,31 @@ img {
 	background-color: transparent;
 	font-size: 9pt;
 }
+#popupback {
+	display: none;
+	position: fixed;
+	z-index: 4;
+	top: 0;
+	left: 0;
+	width: 100%;
+	height: 100%;
+	background-color: #000000aa;
+}
+.dhelp {
+	position: absolute;
+	z-index: 5;
+	width: 500px;
+	background-color: white;
+	color: black;
+	left: 50%;
+	top: 50%;
+	transform: translate(-50%, -50%);
+	padding: 20px;
+}
+.dhelp p {
+	margin: 0;
+	padding: 0;
+}
 
 @media only screen and (max-width:540pt) {
 	.intro, .introe {