How can I determine what width size to select for different fields?

I am not familiar with CSS so I am spending a lot of time having to guess what to type into the free form fields in the CSS injector for my forms. (i.e. what size should I make the Prefix/Suffix name fields, email field, etc.?).

What I see in the design view of Jotform never looks the same on my website, so I am spending hours on trial and error.

Can you help?

You can use the specific #id for these fields to set the width, to get the id check under the properties of the elements

You can then inject you custom css to these specific tags, als for grouped elements such as first name and last name add a margin-left element. See example CSS below

#first_79 {
    width : 70%;
}

#last_79 {
    margin-left : 10px;
}

Hope this helps to resolve you issue, contact us if you have more questions or in need of clarifications