Add box shadow to login box

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/stylesheets/sections/login.scss

@@ -11,6 +11,7 @@
     padding: 20px;
     background: #f5f5f5;
     border: 1px solid #EEE;
+    @include box-shadow(0 1px 1px rgba(0, 0, 0, 0.05));
   }
 
   .brand-image {