BackgroundGrid.css

/* from blue-topaz */
.theme-dark {
  --bg-color-notebook: #2a2825;
  --grid-notebook-line-color-1: #c7c7c71f;
  --grid-notebook-line-color-2: #74747440;
  --dotted-notebook-dot-color: #c7c7c71f;
}
.theme-light {
  --bg-color-notebook: #fef9f1;
  --grid-notebook-line-color-1: #c7c7c740;
  --grid-notebook-line-color-2: #afafaf40;
  --dotted-notebook-dot-color: #c7c7c780;
}

/*notebook background*/
.markdown-reading-view .markdown-rendered,
.markdown-source-view.mod-cm6 .cm-scroller {
  /* background-position: left; */
  /*  background: #2a2825;*/
  /*  background: var(--bg-color-notebook);*/
  background-image: linear-gradient(var(--grid-notebook-line-color-2) 1px, transparent 0),
    linear-gradient(90deg, var(--grid-notebook-line-color-2) 1px, transparent 0),
    linear-gradient(var(--grid-notebook-line-color-1) 1px, transparent 0),
    linear-gradient(90deg, var(--grid-notebook-line-color-1) 1px, transparent 0);
  background-size: 75px 75px, 75px 75px, 15px 15px, 15px 15px;
}
/* 是否随着滚动移动网格 */
/* .markdown-reading-view .markdown-rendered,
.markdown-source-view.mod-cm6 .cm-scroller {
  background-attachment: local !important;
} */