BookStack/resources/sass/_tinymce.scss

.tox.tox-fullscreen {
  position: fixed;
  top: 0;
  height: 100%;
  width: 100%;
  max-width: 100%;
  z-index: 100;
}

.page-content.mce-content-body {
  padding-block-start: 1rem;
  padding-block-end: 1rem;
  outline: 0;
  display: block;
}

.page-content.mce-content-body p {
  line-height: 1.6;
}

.tox-toolbar__primary {
  justify-content: center;
}

/**
 * Format Menu Hacks
 */
.tox-menu .tox-collection__item blockquote::before {
  content: none;
}
.tox-menu .tox-collection__item blockquote {
  border-left: 4px solid var(--color-primary) !important;
  padding: 4px 6px !important;
}
.tox-menu .tox-collection__item blockquote {
  border-left: 4px solid var(--color-primary) !important;
  padding: 4px 6px !important;
}
.tox-menu .tox-collection__item p[style*="background-color"] {
  padding: 4px 6px !important;
  border-left: 3px solid currentColor !important;
}
.tox-menu .tox-collection__item[title^="<"] > div > div {
  font-family: $mono !important;
  border: 1px solid #DDD !important;
  background-color: #EEE !important;
  padding: 4px 6px !important;
}
.tox-menu .tox-collection__item-label {
  line-height: normal !important;
}