Is there any way to change it? I tried defining the toastClass as a class with opacity set to 1, but saw no changes:
.toast-style{
opacity: 1;
}
toastr.options.toastClass = 'toast-style';
No JavaScript required for this. You should be able to change this in CSS using either
#toast-container > div {
opacity:1;
}
or
.toast {
opacity: 1 !important;
}