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HTML

            
              <div id="curly-brace">
  <div id="left" class="brace"></div>
  <div id="right" class="brace"></div>
</div>
!

CSS

            
              body
{
  background-color: #39F;
  color: #FF3;
}

#curly-brace
{
  width: 300px;
  position: absolute;
  left: 50%;
  margin-left: -150px;
  top: 150px;
}

.brace
{
  border-bottom: 5px solid;
  margin: 0 10%;
  width: 30%;
  height: 20px;  
  float: left;
}

.brace:before,
.brace:after
{
  content: "";
  width: 10%;
  height: 50px;
  position: absolute;
  display: block;
}

#left:before
{  
  border-bottom: 5px solid;  
  border-bottom-left-radius: 20px;
  margin-left: -10%;
  margin-top: -30px;
}

#left:after
{
  border-top: 5px solid;
  border-top-right-radius: 20px;
  margin-left: 30%;
  margin-top: 20px;    
}

#right:before
{
  border-top: 5px solid;
  border-top-left-radius: 20px;
  margin-left: -10%;
  margin-top: 20px;
}

#right:after
{
  border-bottom: 5px solid;
  border-bottom-right-radius: 20px;
  margin-left: 30%;
  margin-top: -30px;
}
!

JS
!
999px
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