Added static css styling for templates via a styles property.

src/sheet.js

@@ -18,6 +18,15 @@ class Sheet extends IgniteElement {
         };
     }
 
+    get styles() {
+        return `
+            .sheet {
+                background-color: green;
+                color: #fff;
+            }
+        `;
+    }
+
     render() {
         return this.template
             .class(this.show)
@@ -34,7 +43,7 @@ class Sheet extends IgniteElement {
                     new a("I go nowhere, but you can click me ;)")
                         .on("click", this.linkClick).on("click", this.linkClick2)
                         .style("color", this.color, "important")
-                )
+                ).class("sheet")
             );
     }