The rounded corners are made with CSS code in 'extra properties'

HTML
.b1, .b2, .b3, .b4 {
display:block; 
overflow:hidden;
height:1px;
}
.b1 {
background:#AFC2C7;
margin: 0 5px;
}
.b2, .b3, .b4 {
background:url('/forums/styles/images/rain(3).gif');
border-style:solid;
border-color:#AFC2C7;
}
.b2 {
margin:0 3px; border-width:0 2px;
}
.b3 {
margin:0 2px; border-width:0 1px;
}
.b4 {
margin:0 1px;border-width:0 1px;
}

And being called in the wrappers opening html:
HTML
<table width="100%" border="0" cellpadding="0" cellspacing="0" style="margin-top: 5px">
<tr>
<td>
<b class="b1"></b>
<b class="b2"></b>
<b class="b3"></b>
<b class="b4"></b>
<b class="b4"></b>
<table width="100%" class="t_outer" cellpadding="0" cellspacing="0">
<tr>
<td>
<table width="100%" class="t_inner" cellpadding="0" cellspacing="0">


And closing html:
HTML
</table>
</td>
</tr>
</table>

<b class="b4"></b>
<b class="b4"></b>
<b class="b3"></b>
<b class="b2"></b>
<b class="b1"></b>

</td>
</tr>
</table>


Tables are as default generated with 90° corners. This style add a few pixels above and under the ordinary table, and if you make the ordinary table invisible and pad it all with the same colour or pattern, the table will appears as one unit with rounded corners.

trosfrihed.dk
Custom Ubb 7.5.2