with popup menu

nodejs/public/stylesheets/servicedock.css

@@ -22,6 +22,8 @@ svg {
   max-height: 100%;
   width: auto;
   height: auto;
+  z-index: -1;
+  position: relative;
 }
 
 form {
@@ -238,6 +240,13 @@ table.docker li+li {
   z-index: 0;
 }
 
+#popup {
+  position: fixed;
+  background-color: lightblue;
+  border: .1ex solid blue;
+  text-align: center;
+}
+
 .clear {
   clear: both;
 }