Date Field on mobile

On a desktop, the date fields work just fine. On mobile, the fields are very very tiny. On my phone, I was able to click on them, but I had someone else try it on their phone and it didn’t work.

Can anyone help me make these fields appear larger on mobile??

test.mhmothersclub.com/membership

The particular fields I’m referring to are the children’s birth dates.

Thanks!

https://wordpress.org/plugins/contact-form-7/