Hello,
the answer is simple: in the basic options you need to change the Image/Calendar Width and Height options to match your calendar size. If you use a background image, you have to adjust the text accordingly (font size). Not all styles will look good with all background images. You have to play around with the parameters a little to create your own. It should be flexible enough to make it look nice. have fun with it!

No problem, I understand it takes a little time to get used to make the perfect calendar look.

The style lookup is to give ideas on how the calendar will look like by using that style (I could not give a live example as results may vary according to browsers and CSS3 compatibility). But indeed, this is pure CSS3. The CSS does not break, even if CSS3 is not handled by the user's browser.

The 'Article Details' extension, although working for Joomla! 2.5 (you can see it in my demo site) has been retired by the Joomla! team (it was not taking into account the new Joomla! 2.5 features - images and links -). I am planning on creating a new extension that will take advantage of the code improvements made since on the Latest News Enhanced module and using the new Joomla! standard features.

Thank you for you interest in my work!