Found the source of the issue, not sure how to fix

[bookstack] / resources / assets / sass / _blocks.scss

/*
* This file container all block styling including background shading,
* margins, paddings & borders.
*/


/*
* Background Shading
*/
.shaded {
  background-color: #f1f1f1;
  &.pos {
    background-color: lighten($positive, 40%);
  }
  &.neg {
    background-color: lighten($negative, 20%);
  }
  &.primary {
    background-color: lighten($primary, 40%);
  }
  &.secondary {
    background-color: lighten($secondary, 30%);
  }
}

/*
* Bordering
*/
.bordered {
  border: 1px solid #BBB;
  &.pos {
    border-color: $positive;
  }
  &.neg {
    border-color: $negative;
  }
  &.primary {
    border-color: $primary;
  }
  &.secondary {
    border-color: $secondary;
  }
  &.thick {
    border-width: 2px;
  }
}
.rounded {
  border-radius: 3px;
}

/*
* Padding
*/
.nopadding {
  padding: 0;
}
.padded {
  padding: $-l;
  &.large {
    padding: $-xl;
  }
  >h1, >h2, >h3, >h4 {
    &:first-child {
      margin-top: 0.1em;
    }
  }
}
.padded-vertical, .padded-top {
  padding-top: $-m;
  &.large {
    padding-top: $-xl;
  }
}

.padded-vertical, .padded-bottom {
  padding-bottom: $-m;
  &.large {
    padding-bottom: $-xl;
  }
}
.padded-horizontal, .padded-left {
  padding-left: $-m;
  &.large {
    padding-left: $-xl;
  }
}
.padded-horizontal, .padded-right {
  padding-right: $-m;
  &.large {
    padding-right: $-xl;
  }
}

/*
* Margins
*/
.margins {
  margin: $-l;
  &.large {
    margin: $-xl;
  }
}
.margins-vertical, .margin-top {
  margin-top: $-m;
  &.large {
    margin-top: $-xl;
  }
}
.margins-vertical, .margin-bottom {
  margin-bottom: $-m;
  &.large {
    margin-bottom: $-xl;
  }
}
.margins-horizontal, .margin-left {
  margin-left: $-m;
  &.large {
    margin-left: $-xl;
  }
}
.margins-horizontal, .margin-right {
  margin-right: $-m;
  &.large {
    margin-right: $-xl;
  }
}