CSS Equal Height

Achieving equal column height using only CSS

Unequal Height

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.main, .sidebar {
	float: left;
	padding: 20px;
}
.main {
	width: 400px;
	background-color: LightSlateGrey;
}
.sidebar {
	width: 200px;
	background-color: Tomato;
}

Faux Column

.main, .sidebar {
	float: left;
	padding: 20px;
}
.container {
	background-color: Tomato;
}
.main {
	width: 400px;
	background-color: LightSlateGrey;
}
.sidebar {
	width: 200px;
}

CSS Table

.main, .sidebar {
	float: none;
	padding: 20px;
	vertical-align: top;
}
.container {
	display: table;
}
.main {
	width: 400px;
	background-color: LightSlateGrey;
	display: table-cell;
}
.sidebar {
	width: 200px;
	display: table-cell;
	background-color: Tomato;
}