Improve accessibility

_sass/klise/_base.scss

@@ -243,6 +243,14 @@ a {
   }
 }
 
+// Focusable Elements (e.g. via tabindex)
+.focusable {
+  &:focus {
+    outline: 3px solid rgba(0, 54, 199, 0.6);
+    outline-offset: 2px;
+  }
+}
+
 // Del
 del {
   color: inherit;