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HTML

            
              <!-- TODO clean up names; identify abstractions -->

<h1>Top Brace</h1>
<div style="width: 10em; height: 10em; ">
  <p style="text-align: center; margin: 0">Hello</p> 
  <div class="brace-container">
    <div class="brace top left"></div>
    <div class="brace top right"></div>
  </div>
  <p style="text-align: center; margin: 1em">world</p>
</div> 

<h1>Bottom Brace</h1>
<div style="width: 10em; height: 10em; ">
  <p style="text-align: center; margin: 0">Hello</p> 
  <div class="brace-container">
    <div class="brace bottom left"></div>
    <div class="brace bottom right"></div>
  </div>
  <p style="text-align: center; margin: 1em">world</p> 
</div>

<h2>For fun: asymmetric bottom brace</h2>
<div style="width: 10em; height: 10em; ">
  <p style="text-align: center; margin: 0">Hello</p> 
  <div class="brace-container">
    <div class="brace bottom left d"></div>
    <div class="brace bottom right d"></div>
  </div>
  <p style="text-align: center; margin: 1em">world</p> 
</div>


<h1>Left Brace</h1>
<div style="display: flex; width: 10em; justify-content: center; height: 10em">
  <p style=" align-self: center;">Hello</p> 
  <div class="brace-container side">
    <div class="brace l t"></div>
    <div class="brace l b"></div>
  </div>
  <p style="align-self: center;">World</p> 
</div>


<h1>Right Brace</h1>
<div style="display: flex; width: 10em; justify-content: center; height: 10em">
  <p style=" align-self: center;">Hello</p> 
  <div class="brace-container side">
    <div class="brace r t"></div>
    <div class="brace r b"></div>
  </div>
  <p style="align-self: center;">World</p> 
</div>
!

CSS

            
              $radius: 1em;
$thickness: 0.25em;
$height: 0.5em;

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

.brace-container {
  position: relative;
  width: 100%;
  display: flex;
}

.brace
{
  border-bottom: $thickness solid;
  margin: 0 10%;
  width: 30%;
  height: $height;  
}

.brace:before,
.brace:after
{
  content: "";
  width: 10%;
  height: (2*$height);
  position: absolute;
}

.bottom.left:before
{  
  border-bottom: $thickness solid;  
  border-bottom-left-radius: $radius;
  margin-left: -10%;
  margin-top: -$height;
}

.bottom.left:after
{
  border-top: $thickness solid;
  border-top-right-radius: $radius;
  margin-left: 30%;
  margin-top: $height;    
}
.top.left:before
{  
  border-top: $thickness solid;  
  border-top-left-radius: $radius;
  margin-left: -10%;
  margin-top: $height;
}

.top.left:after
{
  border-bottom: $thickness solid;
  border-bottom-right-radius: $radius;
  margin-left: 30%;
  margin-top: -$height;    
}

.bottom.right:before
{
  border-top: $thickness solid;
  border-top-left-radius: $radius;
  margin-left: -10%;
  margin-top: $height;
}

.bottom.right:after
{
  border-bottom: $thickness solid;
  border-bottom-right-radius: $radius;
  margin-left: 30%;
  margin-top: -$height;
}

.top.right:before
{
  border-bottom: $thickness solid;
  border-bottom-left-radius: $radius;
  margin-left: -10%;
  margin-top: -$height;
}

.top.right:after
{
  border-top: $thickness solid;
  border-top-right-radius: $radius;
  margin-left: 30%;
  margin-top: $height;
}



// a simple twist that's difficult elswhere
.brace.left.d
{
  width: 20%;
}

.left.d:after
{
  margin-left: 20%;
}

.brace.right.d
{
  width: 40%;
}
.brace.right.d:after
{
  margin-left: 40%;
}


.brace-container.side {
  width: 3*$height;
  flex-direction: column;
}

.side .brace
{
  border-right: $thickness solid;
  border-bottom: 0;
  margin: 10% 0;
  height: 30%;
  width: $height;  
}

.side .brace:before,
.side .brace:after
{
  content: "";
  height: 10%;
  width: (2*$height);
  position: absolute;
}

.l.t:before
{  
  border-right: $thickness solid;  
  border-top-right-radius: $radius;
  margin-top: -10%;
  margin-left: -$height;
}

.l.t:after
{
  border-left: $thickness solid;
  border-bottom-left-radius: $radius;
  margin-top: 30%;
  margin-left: $height;    
}

.l.b:before
{
  border-left: $thickness solid;
  border-top-left-radius: $radius;
  margin-top: -10%;
  margin-left: $height;
}

.l.b:after
{
  border-right: $thickness solid;
  border-bottom-right-radius: $radius;
  margin-left:-$height;
  margin-top:  30%;
}

.r.t:before
{  
  border-left: $thickness solid;  
  border-top-left-radius: $radius;
  margin-top: -10%;
  margin-left: $height;
}

.r.t:after
{
  border-right: $thickness solid;
  border-bottom-right-radius: $radius;
  margin-top: 30%;
  margin-left: -$height;    
}

.r.b:before
{
  border-right: $thickness solid;
  border-top-right-radius: $radius;
  margin-top: -10%;
  margin-left: -$height;
}

.r.b:after
{
  border-left: $thickness solid;
  border-bottom-left-radius: $radius;
  margin-left: $height;
  margin-top:  30%;
}

// 
// chrome fix
// 
.brace-container.side {
  width: 1.5em;
  flex-direction: column;
}

.side .brace {
  border-right: 0.25em solid;
  border-bottom: 0;
  margin: 1em 0;
  height: 60%;
  width: 0.5em;
}

.side .brace:before,
.side .brace:after {
  content: "";
  height: 10%;
  width: 1em;
  position: absolute;
}

.l.t:before {
  border-right: 0.25em solid;
  border-top-right-radius: 1em;
  margin-top: -1em;
  margin-left: -0.5em;
}

.l.t:after {
  border-left: 0.25em solid;
  border-bottom-left-radius: 1em;
  margin-top: 3em;
  margin-left: 0.5em;
}

.l.b:before {
  border-left: 0.25em solid;
  border-top-left-radius: 1em;
  margin-top: -1em;
  margin-left: 0.5em;
}

.l.b:after {
  border-right: 0.25em solid;
  border-bottom-right-radius: 1em;
  margin-left: -0.5em;
  margin-top: 3em;
}


.r.t:before
{  
  border-left: $thickness solid;  
  border-top-left-radius: $radius;
  margin-top: -1em;
  margin-left: $height;
}

.r.t:after
{
  border-right: $thickness solid;
  border-bottom-right-radius: $radius;
  margin-top: 3em;
  margin-left: -$height;    
}

.r.b:before
{
  border-right: $thickness solid;
  border-top-right-radius: $radius;
  margin-top: -1em;
  margin-left: -$height;
}

.r.b:after
{
  border-left: $thickness solid;
  border-bottom-left-radius: $radius;
  margin-left: $height;
  margin-top:  3em;
}
!

JS
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