How to set fields to the same strict width

2- I want the "form input" width of  Phone number, Source, and Reason to be the same width as Name, Email, And Zipcode in both DESKTOP and Mobile. I looks funny on desktop and mobile in my opinion how the width doesn't match. Essentially i want the Phone number, Source, and Reason to match the width

You can use the form designer to do that.

Also, try increasing the width of your form since when I checked it was set as 100px.

If the custom code you added is to make your form responsive, I suggest you to try using the following guide instead: https://www.jotform.com/help/311-How-to-make-forms-Mobile-Responsive to enable mobile responsiveness in your form.

doing this messes up my form . it is too small on desktop. my background is not transparent anymore either

It looks like the rest of your fields as now close to the same with.  If you would like to shrink the "Source" field down to the size of the rest, you can add this code to your form:

#input_11 {
    -webkit-appearance : menulist;
    width : 100px;
}

Adjusting the value will adjust the width of that specific dropdown.

using the responsive ,

it injects all kinds of css aside from mine . i think this option works better if i want tio start the form scratch

everytime i use the designer to make changes it inject a whole bunch of lines of css that messes my form. how come ? im using it form minor adjustments. this is why i hate that desiger

how come does it do that, i have to manually remove all the code that render my background white and make my fielda super narrow

I see that you form utilizes a custom theme that loads images for use in the input styling, when using the designer these images are loaded into the CSS code hence the reason for the additional lines of CSS.

Try injecting this CSS into your form to cater for the dissimilar widths

.form-textbox, .form-dropdown{
    min-width: 200px !important;
    max-width: 350px !important;
    width:100% !important;
}

I set the min width to be 200px you can adjust it to your liking, Inject it using the form preferences section and put it at the bottom of the rest of the code.