Icon added for external links

Author: andrewwise

_layouts/default.html

@@ -53,6 +53,11 @@
         display: inline-block;
         color: #606c71;
       }
+
+      a[target=_blank]:after { 
+        content: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAYAAACNMs+9AAAAQElEQVR42qXKwQkAIAxDUUdxtO6/RBQkQZvSi8I/pL4BoGw/XPkh4XigPmsUgh0626AjRsgxHTkUThsG2T/sIlzdTsp52kSS1wAAAABJRU5ErkJggg==);
+        margin: 0 3px 0 5px;
+      }
     </style>
 
     <!-- Google tag (gtag.js) -->