JSFiddle - React, Tailwind, and code Playground

CSS

:root {
  --background-grid-color: deeppink;
  --background-fill-color: #000;
}

html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

body {
  /* Vertical lines */
  background-color: var(--background-fill-color);
  background-image:
    repeating-linear-gradient(
      to right,
      var(--background-grid-color) 0,
      var(--background-grid-color) 1px,
      transparent 1px,
      transparent 200px
    ),
    repeating-linear-gradient(
      to bottom,
      var(--background-grid-color) 0,
      var(--background-grid-color) 1px,
      transparent 1px,
      transparent 200px
    )
  ;
  background-position: 100px 0, 0 0;
}