pligg sidebar resizing

http://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.no-icons.min.css
download the above file.And save it with the same name in your themes css folder.

And then go to pligg.tpl in your theme folder and change this line
<link href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.no-icons.min.css" rel="stylesheet">
with
<link rel="stylesheet" type="text/css" href="{$my_pligg_base}/templates/{$the_template}/css/bootstrap.no-icons.min.css" media="screen" />

Finally now go to the bootsrap.no-icons.min.css file which you saved in your css folder and edit the file and find these two col-md-9 and col-md-3 and change them accordingly and you're done.

Remember default values for col-md-9 is 75% and col-md-3 is 25% so you have to change them correctly and the total value should be 100%.
col-md-9 is the content area so dont reduce it too much.
col-md-3 is the sidebar area.