My flutter website is not displaying blank page on mobile browser

I have created a project using flutter web but after generating the release build, it works fine on desktop browsers but displays a blank (white) page on mobile browsers.

Note that: I also have tried url_stratergy and I am using Flutter version 1.26.0-17-pre. Below is the output of my flutter doctor

I have generated the release build using the following command:

flutter build web --release

You can also visit the website to verify the issue at HerAmigo.

Looking forward to your help and suggestion! Thanks Ayesha Iftikhar