I got some really basic HTML & CSS:
Here's the HTML:
<link rel="stylesheet" media="all" href="stylesheet.css">
vertical-align property only applies to:
inline-level and 'table-cell' elements
See this link.
You could use
line-height to vertically center the text, just make it bigger than the actual
font-size, however it is only effective if the text spans a single line.
Alternatively you could add
padding to the top and bottom of the
header element by equal values.
Edited as per comment: the obvious solution if using HTML5
header element would be to make it
display: table-cell; instead of the default block which I think the reset CSS's apply.