Font size keep changing by depending on Device font size setting

ionic-v1
1

On Android, font-size keep changing by depending on Device font size setting.
i set font-size : 14px !important;.
However, font size is not working on Android Device.
if setting font-size is small on Device, it is smaller than 14px on App.

How can i fix font-size on App , not changing by depending on Device font size setting.
it has problem only on Android.

iOS is not changing font-size by depending on Device font size setting.

i install “Mobile Accessibility” plugin.
But i don’t know how to set only Android platforms.

Thanks.

cli packages: (/usr/local/lib/node_modules)

@ionic/cli-utils  : 1.19.2
ionic (Ionic CLI) : 3.20.0

global packages:

cordova (Cordova CLI) : 8.0.0

local packages:

@ionic/app-scripts : 3.1.6
Cordova Platforms  : android 6.3.0 ios 4.5.4
Ionic Framework    : ionic-angular 3.9.2

System:

Android SDK Tools : 26.1.1
ios-deploy        : 1.9.2
ios-sim           : 6.0.0
Node              : v8.10.0
npm               : 5.6.0
OS                : macOS High Sierra
Xcode             : Xcode 9.4.1 Build version 9F2000