Changing border color on thumbnails

Hi guys,

I'm changing the appearance or my site and have stumbled upon a problem. I cannot seem to find the right place to change the color on both the white space surrounding the entire thumbnail and the white border at the top and bottom of the image itself. More specific in the members box on the front page of Dolphin. I have managed to change this in other boxes on the front page, but the members box remains a mystery to me.

Can anyone help me?

Here's a pic of the section in question:

Thanks, Martin

templates/base/css/general.css

div.thumbnail_block
{
position:relative;
text-align:center;
padding:0px;
margin-right:auto;
background-color:#FFFFFF;
}
div.thumbnail_block img
{
border:1px solid #9B9A9A;
background-position:center;
background-repeat:no-repeat;
}

to:
div.thumbnail_block
{
position:relative;
text-align:center;
padding:0px;
margin-right:auto;
background-color:#cecece;
}
div.thumbnail_block img
{
background-position:center;
background-repeat:no-repeat;
}

Thanks man - works as intended :)

Now just one more problem... Seems that somehow somewhere these borders have been changed in the photo gallery box of the front page, so now they do not respond to the changes you've told me to make, but the rest of the site responds perfectly well.

Any ideas?