Screen abnormality when text is enlarged by clicking the text enlargement button in the browser

[tree800]

Describe the bug
A clear and concise description of what the bug is.
=> Screen abnormality when text is enlarged by clicking the text enlargement button in the browser.
This symptom only appears when running locally but it's ok on a demo site(https://abuanwar072.github.io/Flutter-Responsive-Admin-Panel-or-Dashboard/#/).
How do I make it work like the demo site even when running locally? Is it a build option issue?

To Reproduce
Steps to reproduce the behavior:

1. run this application with Intellij in locally
2. Click the text enlargement button in the browser
3. It works abnormally as in the screenshot below.

Expected behavior
How do I make it work like the demo site even when running locally? Is it a build option issue?

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: window10
• Browser [chrome]
• Version [95.0.4638.69]

Additional context
Add any other context about the problem here.