This plugin allows you to remove (or alter) the arbitrary 10px ‘pad’ that WP inserts on the divs holding images and captions
Just upload the folder to your wp-content/plugins directory and activate the plugin as normal from the admin->plugins menu.
Change the variable $xs to whatever you want. The value corresponds to the padding you wish to add.
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Contributors & Developers
“Fix Image Caption Padding” is open source software. The following people have contributed to this plugin.