How can I reduce the size of my reply boxes to meet the answer size?

How can I vertically align the boxes?

 How can I reduce the size of my reply boxes to meet the answer size?

In your form css, update the input width of your dropdown fields to something smaller than 100%:

100px or a bit larger looked good from my end.

After that, to fix the the alignment of the quantity field I added the following code:

#id_44 {
    margin-left : 40px !important;
}

Here is how the form would with those change made:

https://form.jotformpro.com/72566963652973

You can clone it to your own account if you would like:

https://www.jotform.com/help/42-How-to-Clone-an-Existing-Form-from-a-URL