<div class="rounded-box">
    <!-- Corners -->
    <div class="top-left-corner">
        <div class="top-left-inside">
            &bull;
        </div>
    </div>
    <div class="bottom-left-corner">
        <div class="bottom-left-inside">
            &bull;
        </div>
    </div>
    <div class="top-right-corner">
        <div class="top-right-inside">
            &bull;
        </div>
    </div>
    <div class="bottom-right-corner">
        <div class="bottom-right-inside">
            &bull;
        </div>
    </div>
    <!-- Content -->
    <div class="box-contents">
        Contents go here, but it must be at least
        two lines to look any good.
    </div> <!-- end div.box-contents -->
</div> <!-- end div.rounded-box -->

div.rounded-box {
    width: 9em;
    background-color: #E6E6E6;
    margin: 3px;
}
div.top-left-corner, div.bottom-left-corner,
div.top-right-corner, div.bottom-right-corner
{position:absolute; width:20px; height:20px;
background-color:#FFF; overflow:hidden;}
div.top-left-inside, div.bottom-left-inside,
div.top-right-inside, div.bottom-right-inside
{position:relative; font-size:150px; font-family:arial;
color:#E6E6E6; line-height: 40px;}
div.top-left-corner { top:0px; left:0px; }
div.bottom-left-corner {bottom:0px; left:0px;}
div.top-right-corner {top:0px; right:0px;}
div.bottom-right-corner {bottom: 0px; right:0px;}
div.top-left-inside {left:-8px;}
div.bottom-left-inside {left:-8px; top:-17px;}
div.top-right-inside {left:-25px;}
div.bottom-right-inside {left:-25px; top:-17px;}
div.box-contents {
    position: relative; padding: 8px; color:#000;
}

div {
border:1px solid black;
border-radius-topright: 8px;
border-radius-topleft: 8px;
}