Originariamente inviato da PipinoPiranha™
Grazie mille, molto gentile!

Spero di non aver problemi
Prova anche così:
codice:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Documento senza titolo</title>
<style type="text/css">
<!--
body,td,th {
	color: #000000;
}
body {
	background-color: #FFFFFF;
}
#contenitore {
	position: absolute;
	top: 200px;
	left: 200px;
}
#a {
	background: #000000;
	margin-left: 7px;
	width: 186px;
	height: 1px;
}
#b {
	background: #000000;
	margin-left: 5px;
	width: 190px;
	height: 1px;
}
#c {
	background: #000000;
	margin-left: 3px;
	width: 194px;
	height: 1px;
}
#d {
	background: #000000;
	margin-left: 2px;
	width:196px;
	height: 1px;
}
#e {
	background: #000000;
	margin-left: 2px;
	width: 196px;
	height: 1px;
}
#f {
	background: #000000;
	margin-left: 1px;
	width: 198px;
	height: 1px;
}
#g {
	background: #000000;
	margin-left: 1px;
	width: 198px;
	height: 1px;
}
#h {
	background: #000000;
	margin-left: 0px;
	width: 200px;
	height: 0px;
}
#i {
	background: #000000;
	margin-left: 0px;
	width: 200px;
	height: 1px;
}
#l {
	background: #000000;
	margin-left: 0px;
	width: 200px;
	height: 1px;
}
#contenuto {
	background: #000000;
	color: #FFFFFF;
	padding-left: 5px;
	margin-left: 0px;
	width: 195px;
	height: 200px
}
#m {
	background: #000000;
	margin-left: 0px;
	width: 200px;
	height: 1px;
}
#n {
	background: #000000;
	margin-left: 0px;
	width: 200px;
	height: 1px;
}
#o {
	background: #000000;
	margin-left: 0px;
	width: 200px;
	height: 1px;
}
#p {
	background: #000000;
	margin-left: 1px;
	width: 198px;
	height: 1px;
}
#q {
	background: #000000;
	margin-left: 1px;
	width: 198px;
	height: 1px;
}
#r {
	background: #000000;
	margin-left: 2px;
	width:196px;
	height: 1px;
}
#s {
	background: #000000;
	margin-left: 2px;
	width: 196px;
	height: 1px;
}
#t {
	background: #000000;
	margin-left: 3px;
	width: 194px;
	height: 1px;
}
#u {
	background: #000000;
	margin-left: 5px;
	width: 190px;
	height: 1px;
}
#v {
	background: #000000;
	margin-left: 7px;
	width: 186px;
	height: 1px;
}
-->
</style>
</head>

<body>

<div id="contenitore">
  <div id="a"></div>
  <div id="b"></div>
  <div id="c"></div>
  <div id="d"></div>
  <div id="e"></div>
  <div id="f"></div>
  <div id="g"></div>
  <div id="h"></div>
  <div id="i"></div>
  <div id="l"></div>
  <div id="contenuto">Inserire qui i contenuto del box ad angoli arrotondati.</div>
  <div id="m"></div>
  <div id="n"></div>
  <div id="o"></div>
  <div id="p"></div>
  <div id="q"></div>
  <div id="r"></div>
  <div id="s"></div>
  <div id="t"></div>
  <div id="u"></div>
  <div id="v"></div>

</div>
</body>
</html>