improve alert style

Author: mikebarkmin

packages/markdown/assets/directive-alert/style.css

@@ -4,7 +4,7 @@
 }
 
 .directive-alert>p {
-  margin-bottom: 0;
+  margin-bottom: 10px;
 }
 
 .directive-alert {
@@ -34,6 +34,10 @@
   :first-child {
     margin-top: 0;
   }
+
+  :first-child.p {
+    margin-top: 10px;
+  }
 }
 
 .directive-alert.icon::before {