diff --git a/guacamole/src/main/frontend/src/app/index/styles/animation.css b/guacamole/src/main/frontend/src/app/index/styles/animation.css
index 8bab86fee..c2d48d5e6 100644
--- a/guacamole/src/main/frontend/src/app/index/styles/animation.css
+++ b/guacamole/src/main/frontend/src/app/index/styles/animation.css
@@ -48,3 +48,12 @@
     from { opacity: 1; }
     to   { opacity: 0; }
 }
+
+/**
+ * popin: Increase in size and opacity from invisibly tiny and transparent to
+ * full size and opaque.
+ */
+@keyframes popin {
+    from { transform: scale(0); opacity: 0; }
+    to   { transform: scale(1); }
+}
diff --git a/guacamole/src/main/frontend/src/app/index/styles/other-connections.css b/guacamole/src/main/frontend/src/app/index/styles/other-connections.css
index 36600992b..428d7852f 100644
--- a/guacamole/src/main/frontend/src/app/index/styles/other-connections.css
+++ b/guacamole/src/main/frontend/src/app/index/styles/other-connections.css
@@ -92,6 +92,7 @@
     background: black;
     box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
 
+    animation: 0.1s linear 0s popin;
     opacity: 0.5;
     transition: opacity 0.25s;