master.css

body {
	background: #eee;
}

body:after {
    content: ".";
    display: block;
    height: 0;
    clear: both;
    visibility: hidden;  
}

body.lesson-set {
  background: #fff; 
  font-family: 'Helvetica Neue', Helvetica, sans-serif; 
  margin: 0px 10px 0px 0px;
}
body.lesson-set > h1 {
  border-bottom: 1px solid #dfdfdf;
}
body.lesson-set article > h1 {
  border-bottom: 1px dotted #dfdfdf;
  border-left: 4px solid #ff0000;
  font-size: 18px;
  padding-left: 5px;
}

body.lesson-set nav {
  background-color: #ff0000;
  padding: 3px 5px;
}

body.lesson-set nav a {
  color: #fff;
  font-weight: bold;
  margin-right: 7px;
  text-decoration: none;
}


body.lesson-set section code {
  background-color: #000;
  color: #fff;
  font-family: consolas, monospace;
  padding: 0px 5px;
}

body.lesson-set section h1 {
  color: #555;
  font-size: 13px;
  margin-bottom: 5px;
  text-transform: uppercase;
}

button#run {
  bottom: 5px;
  font-size: 30px;
  position: absolute;
  right: 150px;
}

button#open {
  bottom: 5px;
  font-size: 30px;
  position: absolute;
  right: 50px;
}

button#save {
  bottom: 5px;
  font-size: 30px;
  position: absolute;
  right: 5px;
}

.CodeMirror-line-numbers {
  width: 2.2em;
  color: #999;
  background-color: #333;
  text-align: right;
  padding: .4em;
  margin: 0;
  font-size: 12pt;
  line-height: 1.1em;
  font-family: consolas, monospace;
}

#input {
  float: left;
  position: relative;
  width: 50%;
}

iframe {
  border: none;
  height: 100%;
  width: 100%;
}

iframe h1 {
  font-size: 14px;
}

#output {
}

#stdout {
}

#stderr {
	color: #990000;
}

#tabs {
  height: 94%;
  position: absolute;
  right: 0px;
  top: 1%;
  width: 49%;
}
.ui-tabs-panel {
  height: 85%;
  position: relative;
}

canvas {
  border: none;
  height: 100%;
  width: 100%;
}