why in creating a webpage we need to follow 60% the content and 40% the creativity?

In creating a web page, there is a category that we to follow. The content must be 60% and the design or creativity must be 40%. The purpose of these is that, your web page is not boring to read and it is attractive to see and it can really get the attention of the reader. The design must be entertaining and it should have a connection to your content, so that it is interesting to read.