Checkboxes not styled correctly on live phone

[nvella]

Describe the bug
Checkboxes are not styled correctly when running the KaiUI sample app on a live KaiOS phone. Tested with a Nokia 2720 Flip.

To Reproduce
Steps to reproduce the behavior:

1. Build a production build of the app
2. Deploy the production build output to a KaiOS phone

Screenshots
Expected:

Actual:

Feature Phone:

• Device: Nokia 2720
• OS: KaiOS
• Version 2.5.2

[nvella]

Hosting the app build output and navigating to it in a desktop browser displays the checkboxes as expected.