That ID is generated by the ID of the block in the database. If you go to example.com/admin/structure/block you'll see a list of blocks, and if you find the block that represents your footer and click on the configure link next to it, you'll see the block ID in the URL. In your case it would look something like:
admin/structure/block/manage/block/1/configure
A common format for CSS IDs for blocks is block-MODULENAME-ID. So in this case your block is provided by the block module (which handles the blocks that you can edit on the blocks page) and it's ID is 1.
-Mike
Hakan wrote:
In Drupal 7, I have created a subtheme from Zen which I am - whenever I have some spare time - slowly developing into the custom theme for one of my websites. Obviously this is a learning experience although I do have a little experience from Drupal 6 several years back.
I have installed Firebug under Firefox and am using it to look at various properties of one of the pages I am theming. My footer message shows an id of "block-block-1" - which I have then used to assign the appropriate CSS property values. I would, however, like to understand where/how that id is generated and did a grep of the entire website looking for that particular id. I only found it in the Zen theme and in my derived subtheme, not in any particular Drupal file.
Could someone who knows Drupal 7 better tell me where that particular id is generated for the footer message?
Thanks.