The below solution can resolve for Shopping, Checkout, MyAccount and Landing pages at various zooming %.
div#main-container {
max-width: 1920px;
margin:
auto;
}
So the above css need to be added in the extension which is created for Shopping, Checkou and MyAccout otherwise it wil work for only the particular pages which extension is created.
Else we can give that in theme.
The below screenshot at 100%, 90% and 80%.
