<div id="shasen"></div>
#shasen {
  width: 300px;
	height: 300px;
  margin: 0 auto;
	background: linear-gradient(
	-60deg,
	#fff,
	#fff 45%,
	#55cc33 45%,
	#55cc33 50%,
	#fff 50%,
	#fff 95%,
	#55cc33 95%,
	#55cc33
	);
	background-size:  30px;
}

External CSS

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External JavaScript

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