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    I am also having this problem of a border showing around custom blocks, and have tried everything listed here. I am trying to create a custom theme. Fieldset is not listed in the code for theme_blockcenter_l, or theme_centerblock_c. I have tried adding the code fieldset as suggested in previous threads. Nothing is working and it's driving me crazy. The site is here: 
http://www.marketagenda.com There is also a space at the bottom that I can't get rid of. 
Please help.
Thanks,
Bethany
Here is the CSS code I am using:
body {
 font-family: Arial, Helvetica, sans-serif;
 font-size: 11px;
 padding: 0px;
 margin:0px 
.login{
 height: 272px;
 width: 288px;
 padding-left: 110px;
 padding-top: 25px;
 background-repeat:no-repeat;
 background-image: url(
http://www.marketagenda.com/themes/homepage/images/index_03.jpg); 
}.login a:link {
color:#FFFFFF;
}.login a:visited {
color:#FFFFFF;
}
.login .header{
 color: #FFFFFF;
 padding: 12px 2px 0px 30px;
 font-weight: normal;
 text-align: left;
}
.login .body{
 color: #FFFFFF;
 padding: 3px 15px 0px 30px;
 text-align: left;
}
}
.block1 {
 background-image: url(images/index_01.jpg);
 height: 393px;
 width: 398px;
 border-top-width: 0px;
 border-right-width: 0px;
 border-bottom-width: 0px;
 border-left-width: 0px; 
}
.block2 {
 background-image: url(images/index_02.jpg);
 height: 632px;
 width: 626px;
 border-top-width: 0px;
 border-right-width: 0px;
 border-bottom-width: 0px;
 border-left-width: 0px;  
}
.block3 {
 background-image: url(images/index_03.jpg);
 height: 272px;
 width: 398px; 
}
fieldset {
border: 0px solid #FFFFFF;
}