Change font family in contact form

AHoy –

I’m looking to change the font family for the contact form. I used this code which I found in a thread but when I use it – elements of my site get distorted – the instagram and full width sub menu

Screenshots of what it does to these elements

form * {
    font-family: "Work Sans", sans-serif !important;

Is there a code the could change the font but not change those other elements?