Remove shadow around images

Try adding this coding into your CSS, it worked for the Twenty Twelve theme anyway:

.entry-content img,
.comment-content img,
.widget img,
img.header-image,
.author-avatar img,
img.wp-post-image{box-shadow: none;}

It always helps to add a link to your site whenever you post a question. Otherwise, it is virtually impossible to provide a specific suggestion.

Thanx Mama, I have seen various snippets of code on the web, and have tried them all (including your code snippet). Unfortunately, none of them seem to work for me.

To: Crouching, I am doing this website for a client, and they need me to keep it under wraps for now, they are afraid of competition. If anyone loads Twenty Ten as the default theme, add a picture to a page, it will have the shadow/border around it. It’s not something I did, just the coding in the themes core. I know there is way to eliminate this, but I am just not finding the solution.

Do the photos have a caption? You can try adding this CSS rule:

.wp-caption {
   background: transparent;
}

No, the photos do not have a caption, Crouching. This seems to be a very common issue, I have seen countless questions about the border/shadow on the web. Leafing through the Style CSS sheet, I see a few lines of code that could account for this, but when I comment them all out, the border/shadow still remains. I don’t have this problem with the other themes I have used, so I don’t think it’s a core WordPress line of code.

Very strange. I just added two pictures to this page and the only picture which had some sort of shading was the one with a caption. Have you tried disabling all of your plugins? Sometimes, a gallery plugin or an image plugin (like Fancybox or Easybox) will add some styling to images.