playground.css

body {
  font-family: Monaco, Consolas, monospace;
  font-size: 9pt;
  background-color: white;
  margin: 0;
}
:focus { outline: 0; }

h1 {
  font-family: monospace;
  line-height: 1em;
  padding: 10px;
  text-align: right;
  color: black;
  margin-bottom: 0;
}

h1 span {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1.8em;
  z-index: 1;
  background-image: -webkit-gradient(linear, left top, left bottom, from(rgba(255,255,255,0.0)), to(rgba(255,255,255,0.55)), color-stop(.5, rgba(255, 255, 255, 0.3)));
}

#split-vertical {
  bottom: 0;
  background-color: #4A9CB2;
}

#data, #tmpl, #result {
  font: inherit;
  margin: 0;
  border: 0;
  white-space: pre;
  overflow: auto;
  position: absolute;
  left: 0;
  bottom: 0;
  top: 0;
  right: 0;
  padding: 5px;
  background-color: white;
}

#data, #result { top: 3px; }

.vsplitbar {
  width: 3px;
  background-color: #4A9CB2;
}

.hsplitbar {
  height: 3px;
  background-color: #4A9CB2;
}

.error {
  position: absolute;
  bottom: 0;
  right: 0;
  background-color: #DA6F2B;
  color: white;
  border-top-left-radius: 10px;
  padding: 5px 8px;
  text-align: center;
}

.name {
  position: absolute;
  top: 0;
  right: 0;
  background-color: #4A9CB2;
  border-bottom-left-radius: 10px;
  color: white;
  padding: 5px 8px;
  text-align: center;
  z-index: 1;
}

.permalink {
  position: absolute;
  bottom: 0;
  right: 0;
  background-color: #AB3152;
  color: white;
  border-top-left-radius: 10px;
  padding: 5px 8px;
  text-align: center;
}

.permalink a {
    color: inherit;
}