codenothing/CSSTree

* {
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
}

html, body {
    font: 14px Helvetica;
    color: #333;
    background: #f5f5f5;
    padding: 0;
    margin: 0;
    height: 100%;
    text-shadow: 0 1px 0 #eee;
}

.hide {
    display: none !important;
}

#body {
    width: 80%;
    min-width: 900px;
    margin: 40px auto;
}

h2 {
    margin: 0;
    padding: 10px 0;
}

.content {
    position: relative;
    width: 100%;
    height: 400px;
}

textarea {
    width: 100%;
    height: 100%;
    border: 1px solid #737373;
}

pre {
    display: block;
    position: absolute;
    top: 0;
    right: 0;
    width: 49.8%;
    height: 100%;
    overflow: auto;
    border: 1px solid #737373;
    background: #e3fbfd;
    margin: 0;
    padding: 4px;
}

.content.active textarea {
    width: 49.8%;
}