toasts docs and example class option added

pages/_docs/toasts.md

@@ -5,10 +5,25 @@ description: The toast component is like an alert box that is only shown for a c
 bootstrap-link: components/toasts/
 ---
 
-
-
 ### Default markup
 
 {% example %}
 {% include ui/toast.html %}
 {% endexample %}
+
+### Translucent
+
+Toasts are slightly translucent, too, so they blend over whatever they might appear over. For browsers that support the `backdrop-filter` CSS property, we’ll also attempt to blur the elements under a toast.
+
+{% example html class=bg-gray %}
+{% include ui/toast.html %}
+{% endexample %}
+
+### Stacking toasts
+
+If you want to stack toasts just put them in the same container.
+
+{% example %}
+{% include ui/toast.html person-id=3 %}
+{% include ui/toast.html date="7 mins ago" text="This is another toast message." %}
+{% endexample %}