html {
	height: 100%;
	background: linear-gradient(120deg, 
		#000 .125em, #0092b7 .125em, 
		#0092b7 calc(50% - .125em), #000 calc(50% - .125em), 
		#000 calc(50% + .125em), #0092b7 calc(50% + .125em), 
	  #0092b7 calc(100% - .125em), #000 calc(100% - .125em));
	background-size: 1.5em/sqrt(2) 1.5em/sqrt(2);
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.