Adding drag-n-drop feedback to app install.

Change-Id: I82718d930e2121f4e6c8109a89513fa755c18141
diff --git a/web/gui/src/main/webapp/app/view/app/app.css b/web/gui/src/main/webapp/app/view/app/app.css
index bca30ec..339689b 100644
--- a/web/gui/src/main/webapp/app/view/app/app.css
+++ b/web/gui/src/main/webapp/app/view/app/app.css
@@ -173,3 +173,15 @@
 .dark #application-details-panel .bottom tr:nth-child(even) {
     background-color: #555;
 }
+
+.dropping {
+
+}
+
+.light div.dropping {
+    border: solid 3px deepskyblue;
+}
+
+.dark div.dropping {
+    border: solid 3px deepskyblue;
+}