[4.0.0-beta.19] Modal css box-shadow not appear in browser

[MarcAndreC]

Bug Report

Ionic version:
[x] **4.0.0 BETA.19

Current behavior:
I've juste updated from beta 17 to 19 and drop shadow effect around modal not appear anymore on "ionic serve". While reviewing the css, it seem --box-shadow var is present in the css inspector but have no effect.

Expected behavior:
It suppose to be a drop shadow effect around the modal.

Steps to reproduce:
Create a new project (blank template), add a button that open a modal with all the code to make it work (copy paste from the doc).

Other information:
The bug isn't present in beta 17. I haven't tried beta 18.

Ionic info:

Ionic:

ionic (Ionic CLI) : 4.5.0 (C:\Users\xxxxxxxxxxxx\AppData\Roaming\npm\node_modules\ionic)
Ionic Framework : @ionic/angular 4.0.0-beta.19
@angular-devkit/build-angular : 0.10.7
@angular-devkit/schematics : 7.0.7
@angular/cli : 7.0.7
@ionic/angular-toolkit : 1.2.0

System:

NodeJS : v8.11.3 (C:\Program Files\nodejs\node.exe)
npm : 5.6.0
OS : Windows 10

[ionitron-bot]

Thanks for the issue! This issue is being locked to prevent comments that are not relevant to the original issue. If this is still an issue with the latest version of Ionic, please create a new issue and ensure the template is fully filled out.