Hmm Ok, I try some tests, and your file :
<div class="fb-like-box" style="background-color: auto;" colorscheme="<?php echo $ColorScheme; ?>" data-header="<?php echo $Header; ?>" data-height="<?php echo $Height; ?>" data-href="<?php echo $FacebookPageURL; ?>" data-show-border="<?php echo $ShowBorder; ?>" data-show-faces="<?php echo $ShowFaces; ?>" data-stream="<?php echo $Stream; ?>" data-width="<?php echo $Width; ?>" data-force-wall="<?php echo $ForceWall; ?>"></div>
is responsible, border is forced to true right ?
If I write “0” : Borders gone …
But we can’t change it by css … strange …
You are right, it should work … but that’s not the case …
But for others “inside” borders … no solutions ?