All Chatboxes are customizable for color, size, location on page, graphics used for chat icon, and graphics used for photos within the chatbox. This is not a pop up, but rather a script or chat rollover box. There are countless customizations you can make, but the objective is to maintain your look and feel of your website.
With Version 4.1, you now have a different simple style of website. As well, you also have a smart phone style for mobile phone users.