css fix for keyboard navigatin

light base css update (border + padding) in order to improve keyboard
navigation behaviour (article doesn't move when selected).

assets/css/app.css

@@ -35,7 +35,7 @@ a:focus {
 }
 
 a:hover {
-    color: #333;
+	color: #333;
     text-decoration: none;
 }
 
@@ -365,7 +365,10 @@ nav .active a {
 
 /* items listing */
 .items article {
+    border: 1px dotted #ddd;
     margin-bottom: 20px;
+	padding: 5px;
+	background-color: #fff;
 }
 
 .items h2 {
@@ -395,18 +398,16 @@ nav .active a {
 }
 
 .items .preview {
-    color: #555;
     line-height: 1.5em;
     font-size: 100%;
     font-family: Georgia, serif;
 }
 
 .items #current-item {
-    border: 2px dashed #d14;
-    padding: 5px;
+	border: 3px solid #bce;
+    padding: 3px;
 }
 
-
 /* item */
 .item {
     padding-left: 5px;