Dialog backdrop not matching Fluent React

[gabbsmo]

Describe the bug
The backdrop for modal dialogs is not matching Fluent UI and is using browser defaults. In Microsoft Edge this means that the background is distorted rather than darkened.

To Reproduce
Steps to reproduce the behavior:

1. Go to Style Guide
2. Compare with Fluent React

Expected behavior
The backdrop should match Fluent React

Desktop (please complete the following information):

• OS: Windows 11
• Browser: Edge
• Version: 147

Additional context
The following style can be used as a workaround in your own CSS.

.hoo-dlg::backdrop {
    background: var(--blackTranslucent40);
    backdrop-filter: none;
}