File viewer's PDF toolbar not rendering on Safari

[princetonacelopez]

Issue Title

File viewer's PDF toolbar not rendering on Safari

Description

The file viewer toolbar is not rendering on Safari, but it renders on other browsers.

Steps to reproduce

1. Open a web page that contains an embedded PDF file.
2. The toolbar should appear at the top of the PDF file.
3. Open the same web page in Safari.
4. The toolbar will not appear.

Expected behavior

The toolbar should appear in all browsers.

Actual behavior

The toolbar only appears in browsers other than Safari.

Reproduced on

• Safari 14.1+
• Other browsers: Chrome, Firefox, Edge