How do you stop input button fields doubling up on Firefox, Windows 7?

Question

Does anyone know how to resolve this browser issue where button input fields double up on Windows 7 Firefox (v 31)?

The secondary buttons hide the number field.

You can view the +/- buttons in question that are next to the "Add to basket" button here...

http://instituteofleadership.org.uk/wp/product/personal-leadership-programme/

Thanks

Answer 1

input[type=number] {
-moz-appearance:textfield;
}

/* hides the spin-button for chrome*/
input[type=number]::-webkit-outer-spin-button,
input[type=number]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

source: https://stackoverflow.com/a/23374725/4016757