CSS Layout Questions

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Only making baby steps in CSS still but I am learning a lot. Here's a link to the page I am trying to create: http://www3.telus.net/~jessum/details_layout.html
Here's what I have managed to create so far: http://www3.telus.net/~jessum/details.html
When explaining any steps please explain it using Dreamweaver. I will be looking in the code to see how it all works but I want to be able to get proficient using Dreamweaver so I can see how things flow etc. before I try and hand code.
Questions
1. Is it a good practice to use a "container" to hold all of the div's or is it better to start by adding a header without a container?
2. How can I centre a div in the page?
I read that to align the div so it's "centred' in the page I can use: margin: auto;
but I'm not sure how to do this. Please explain.
3. How do I remove the space around the "container"? I've set the margin and padding to: "0" but the space is still there.
Thanks
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Replay

osgood_ wrote:
Not sure where this notion of using the body as a container came from but for years a wrapper or container was considered standard practice.
The idea is being promoted by several of the most active and knowledgeable members of this forum. I think the idea first came from Altruistic Gramps, and I remember debating the issue with him about a year ago. It has also been picked up enthusiastically by Murray, and I've seen Nancy O suggest the same idea.
I've been doing a lot of research into CSS3 recently, and discovered that the Borders and Backgrounds module specifically advises against styling the <html> element (http://www.w3.org/TR/css3-background/#special-backgrounds). It doesn't give a reason for this recommendation.
I suppose the idea of giving the body a width instead of using a container might come from the HTML5 definition of the body as representing the main content of the document (http://dev.w3.org/html5/spec/the-body-element.html#the-body-element).
I suspect that this is likely to develop into the same type of fruitless argument as we had several years ago about the "superiority" of ems over pixels. Adding a single <div> to act as the container or wrapper for the content doesn't strike me as being less efficient. It also has the advantage of avoiding styling the <html> element.