BookStack/resources/assets/sass/export-styles.scss

@import "variables";
@import "mixins";
@import "html";
@import "text";
@import "grid";
@import "blocks";
@import "forms";
@import "tables";
@import "header";
@import "lists";
@import "pages";

table {
  border-spacing: 0;
  border-collapse: collapse;
}