Why is my custom block template applying to all blocks? I have a region on my home page called home_area_1. It contains several blocks. I want those blocks to be formatted in the same way, so I created a template called block--home-area-1.tpl.php. It is formatting those blocks correctly, but it's also being applied to blocks in other regions on the home page.

What am I doing wrong? I only want the blocks in this particular region to use this template.

I'm on Drupal 7.35, and am fairly new at this.
As stated in Drupal 7 Template (Theme Hook) Suggestions, it suggests the file name structure to be like block--sidebar_first.tpl.php.

==EDITED==

In my themename.info file I declared

regions[sidebar_first] = First Sidebar


Copied the core block.tpl.php file, renamed it to block--sidebar_first.tpl.php, added "BLOCK NAKO" text.

Then I Flushed Caches. The image below is the result.



As you can see the footer region blocks doesn't have the override that I only set for blocks within the sidebar first region.