added example

Author: Ivan Demidov

docs/assets/css/demo.css

@@ -23,4 +23,11 @@ h1, h2 { text-transform: capitalize; }
 .demo-row [class*="sl-row"] {
 	background-color: #cfd8dc;
 	border: 1px solid #90a4ae;
+}
+.demo	{
+	background-color: turquoise;
+	height: 100%;
+}
+.demo-container {
+	background-color: cadetblue;
 }