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

.source-area {
	margin-top: 10px;
	padding: 5px;
	width: 100%;
	background-color: #eee;
	overflow-x: scroll;
}

.main {
	padding: 10px;
}

.column {
	padding: 5px;
	float: left;
	width: 50%;
}