Add example for link background.

docs/examples/styles/link_background.css

@@ -0,0 +1,11 @@
+#lbl1, #lbl2 {
+    link-background: red;  /* (1)! */
+}
+
+#lbl3 {
+    link-background: hsl(60,100%,50%) 50%;
+}
+
+#lbl4 {
+    link-background: $accent;
+}

docs/examples/styles/link_background.py

@@ -0,0 +1,25 @@
+from textual.app import App
+from textual.widgets import Label
+
+
+class LinkBackgroundApp(App):
+    def compose(self):
+        yield Label(
+            "Visit the [link=https://textualize.io]Textualize[/link] website.",
+            id="lbl1",  # (1)!
+        )
+        yield Label(
+            "Click [@click=app.bell]here[/] for the bell sound.",
+            id="lbl2",  # (2)!
+        )
+        yield Label(
+            "You can also click [@click=app.bell]here[/] for the bell sound.",
+            id="lbl3",  # (3)!
+        )
+        yield Label(
+            "[@click=app.quit]Exit this application.[/]",
+            id="lbl4",  # (4)!
+        )
+
+
+app = LinkBackgroundApp(css_path="link_background.css")