Not easily is the answer. Here is a link to a page that enables you to put static headers and footers on the page. You could do that, setting each at 18px high, and leaving the content blank, but beware, it is buggy.
I often find the better option is to use JavaScript.
You could put an 18px top-padding attribute to the body style.
What I most commonly do is create an all content class. This is a division that holds all the content. I'm guessing you are using a fixed width for the div you want centered.
So what I would do is something like
You could put an 18px top-padding attribute to the body style.
What I most commonly do is create an all content class. This is a division that holds all the content. I'm guessing you are using a fixed width for the div you want centered.
So what I would do is something like
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