Round Crrner Div CSS

style type="text/css">
.rtop, .rbottom{display:block; }
.rtop *, .rbottom *{display: block; height: 1px; overflow: hidden}
.r1{margin: 0 5px; background:#9BD1FA;}
.r2{margin: 0 3px; background:#9BD1FA;}
.r3{margin: 0 2px; background:#9BD1FA;}
.r4{margin: 0 1px; height: 2px; background:#9BD1FA;}
.contain{background:#9BD1FA;text-align:center;}
/style>
div id="container" style="width:100px;">
b class="rtop">
b class="r1">
b class="r2">
b class="r3">
b class="r4">
/b>
div class="contain">Happy Birthday