http://debray-jerome.developpez.com/articles/geometrie-avec-css/
border-radius: 13em/3em;
border: 1px solid #069; border-color: transparent transparent #069 transparent; border-width: 60px;
width:300px; height:100px; background:#069; -webkit-transform:skew(30deg); -moz-transform:skew(30deg); -o-transform:skew(30deg); tranform:skew(30deg);
border-radius: 10px 75px 10px 10px / 10px 30px 10px 10px;
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