which tag in the style sheet is “responsible” for the width of the post?

How do I change to include only post I want ?
For example post # 43 and Post#2
I know its with this syntech… somehow

<?php if (have_posts()) : ?>

<?php while (have_posts()) : the_post(); ?>

New about me:
My name is grace
This is my space.

Photo Imagining in the Digital World
with Olivia Parker
Saturday, July 21, 10am-5pm
Sunday, July 22, 10am-5pm
Thursday, July 26, 5-8pm
The workshop will meet at the PRC, 832 Commonwealth Avenue, Boston
$250 Members/$295 Non-Members/$175 for full time students
Registration is required. To register please call 617.975.0600.
In this workshop we will explore the development of image ideas as well as the technical possibilities in Photoshop that open the door to individual expression. With an emphasis on the layers pallet we will work with both single images and composites to see past the usual color correction, crop, and sharpen of single images and the ordinary cut and paste of composites. Moving toward its expressive potential, a digital image can evoke thoughts in the viewer that go well beyond the Wow! How did they do that?

For a more detailed workshop description please visit the PRC website’s Upcoming Programs page.
Image Credit: Toadstool, 2005. ? Olivia Parker
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hi

Any one knows which tag in the style sheet is “responsible” for the width of the post?
My posts are keep getting into my right side bar and I am trying to move them more to the lest, tried different tags but no luck.
Help? Ideas ?

Thanks.
~ Grace