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Oh, right! I've found the reason for the problem.
I ran the page through a CSS validator (http://jigsaw.w3.org/css-validator), and it complained about margin etc. parameters that did not include dimensions.
My mistake was to assume that no dimensions should implicitly be interpreted as pixels, but apparently I was wrong. After adding "px" to the dimensions, everything is OK.
Ah, and now the CSS validator also complained about several "margin" commands in the xoops' default.css, which I think should be fixed as they are most certainly ignored by most browsers.
I ran the page through a CSS validator (http://jigsaw.w3.org/css-validator), and it complained about margin etc. parameters that did not include dimensions.
My mistake was to assume that no dimensions should implicitly be interpreted as pixels, but apparently I was wrong. After adding "px" to the dimensions, everything is OK.
Ah, and now the CSS validator also complained about several "margin" commands in the xoops' default.css, which I think should be fixed as they are most certainly ignored by most browsers.