diff --git a/style.css b/style.css
index c456b0c..4f383b8 100755
--- a/style.css
+++ b/style.css
@@ -108,6 +108,18 @@ body > header {
 }
 
 
+/**********************************/
+/* 2a. Sidebar hover effect       */
+
+#sidebar {
+	opacity: 0.2;
+	transition: opacity 1.5s;
+	}
+
+#sidebar:hover {
+	opacity: 1.0;
+	}
+
 
 /**********************************/
 /* 3. Top Elements                */