Stile <kbd> elements more like keyboard buttons.

#440

Author: encukou

naucse/static/css/body.css

@@ -13,10 +13,14 @@ hr.lesson-end {
 }
 
 p kbd {
-    background-color: #DDD;
-    border: 1px solid black;
+    background-color: #f5f5f5;
+    border: 1px solid #ccc;
+    border-bottom-width: 3px;
+    border-radius: 3px;
     color: black;
     font-style: normal;
+    padding-bottom: 0;
+    box-shadow:inset 0px 1px 0px 0px #fff;
 }
 
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