setDefaultStyles method
Overrides the "master.css" file contents with the contents of masterCss.
reload specifies the necessity of reloading book's chapters (provided the book is opened).
Pass "false" if the book is not opened yet.
Implementation
void setDefaultStyles(String masterCss, {bool reload = true}) {
Pointer<BufferString> bs = BufferString.fromDartString(masterCss);
setDefaultStylesNative?.call(_sdk, bs, reload);
freeBufferString(bs);
}