function linearGradient (direction, top, bottom, base = '') {
	return {
		background: `linear-gradient(${direction}, ${top} 0%, ${bottom} 100%) ${base}`,
	};
}
Linear Gradient
	==============================

	Short-hand helper for adding a linear gradient to your component.

	- @param {String} sideOrCorner
	- @param {String} top
	- @param {String} bottom
	- @param {String} base (optional)
	- @returns {Object} css linear gradient declaration

	Spread the declaration into your component class:
	------------------------------

	myComponentClass: {
		...linearGradient(red, blue),
	}