No mirror margins?

Is there a way to add CSS code for a book or collection that turns off mirror margins so that the left and right margins are identical? I believe someone may have asked a similar question in relation to big books, but it would be helpful to me to have a way to do this for any book. There are cases where the pages will not be bound but will be used individually, and a wider inside margin makes no sense.

Hi Paul,
At this time you’d have to create a customBookSyltes.css in the books folder, then fill that with a rule like this

.A4Portrait .marginBox{
    left:10mm !important;
    right: 10mm !important;
    width: 190mm !important;

Perfect–thank you.

I see that you can do the same for other page sizes as long as the three numbers add up to the width in mm of that page size.