style.css

* {
	margin: 0;
	padding: 0;
}
html, body {
	background: #EEE;
	font: 12px sans-serif;
}
body {
	padding-top: 1.8em;
	-webkit-box-sizing: border-box;
	-moz-box-sizing: border-box;
	box-sizing: border-box;
}
html, body, table, tbody, tr, td {
	height: 100%
}
table {
	table-layout: fixed;
	width: 100%;
}
td {
	width: 33%;
	padding: 3px 4px;
	border: 1px solid transparent;
	vertical-align: top;
	font: 1em monospace;
	text-align: left;
	white-space: pre-wrap;
}
h1 {
	display: inline;
	font-size: 100%;
}
del {
	text-decoration: none;
	color: #b30000;
	background: #fadad7;
}
ins {
	background: #eaf2c2;
	color: #406619;
	text-decoration: none;
}

#result {
	white-space: pre-wrap;
}

#settings {
	position: absolute;
	top: 0;
	left: 5px;
	right: 5px;
	height: 2em;
	line-height: 2em;
}
#settings label {
	margin-left: 1em;
}

.source {
	position: absolute;
	right: 1%;
	top: .2em;
}

[contentEditable] {
	background: #F9F9F9;
	border-color: #BBB #D9D9D9 #DDD;
	border-radius: 4px;
	-webkit-user-modify: read-write-plaintext-only;
	outline: none;
}
[contentEditable]:focus {
	background: #FFF;
	border-color: #6699cc;
	box-shadow: 0 0 4px #2175c9;
}

@-moz-document url-prefix() {
	body {
		height: 99%; /* Hide scroll bar in Firefox */
	}
}