Actually (and not to be mean :”>) but you can copyright source code, because the source code is included in the character, without the source the colors and layout wouldnt take shape, much like you can copyright a books contents, there is no discretion in that point of view.
https://www.godaddy.com/gdshop/copyright/landing_choice.asp?se=%2B&ci=2751
There is an example of a company that offers such copyright automation for you, most sites dont copyright correctly by commenting their source and saying My Source is protected so back off. Its the same as expression engine in a sense I guess, they dont copyright only the design, they copyright the source code in their backend as well.
Your website source is the same as software source in a sense I guess I should say.
EX Of how you would do something like that:
/* inet-logic.com design and layout */
/* You may adapt and learn from the elements of this CSS to use in your own projects, but you may not copy the design */
/* (the unique combination of images, colors, sizes, typography, and positioning) since this is copyright 2005
/* of Jordon Bedwell and iNET Logic and may not be reproduced. */
You are right in a sense though, you couldnt copyright a general layout grid (for example <table><tr><td><javascript>document.write(‘hello world’);</javascript></td></tr></table> but you need to tack on your design and include the source for example your styles, your unique combination of table elements and flah flah flah.