Hi Kaspar,

I hope you are well today and thank you for your question.

Not sure exactly what you are trying to achieve here by zooming in website but you can reduce its width same as zooming in 80% by adding the following CSS code in the Custom CSS code option of your theme on the below path.

Admin Area -> Appearance -> Theme Settings -> Custom Code -> CSS Code

@media (min-width: 1200px){
#page-container .container {
    max-width: 980px !important;
}
}

Best regards,
Shufflehound team