html {
  background:
   conic-gradient(from -45deg,#ECEDDC 90deg,#0000   90.5deg),
   conic-gradient(from 135deg,#ECEDDC 90deg,#29AB87 90.5deg) 50px 0;
  background-size: 100px 100px
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.