Update settings.php

[bookstack] / resources / sass / print-styles.scss

@import "variables";

header {
  display: none;
}

html, body {
  font-size: 12px;
  background-color: #FFF;
}

.page-content {
  margin: 0 auto;
}

.print-hidden {
  display: none !important;
}

.tri-layout-container {
  grid-template-columns: 1fr;
  grid-template-areas: "b";
  margin-inline-start: 0;
  margin-inline-end: 0;
  display: block;
}

.card {
  box-shadow: none;
}

.content-wrap.card {
  padding-inline-start: 0;
  padding-inline-end: 0;
}