View source for Template:Columns/styles.css

/* Content in columns with CSS instead of tables ([[Template:Columns]]) */
/* {{pp-template}} */
div.columns-2 div.column {
	/* @noflip */
	float: left;
	width: 50%;
	min-width: 300px;
}
div.columns-3 div.column {
	/* @noflip */
	float: left;
	width: 33.3%;
	min-width: 200px;
}
div.columns-4 div.column {
	/* @noflip */
	float: left;
	width: 25%;
	min-width: 150px;
}
div.columns-5 div.column {
	/* @noflip */
	float: left;
	width: 20%;
	min-width: 120px;
}