SolarWinds Web Help Desk 'attachmentWindow' size

Question

I'm redesigning the UI of Web Help Desk for use with my organization.

In the User Portal for end users, it has a button to attach a file when creating a ticket. When clicking the button, it calls:

<a target="attachmentWindow" onclick="javascript:window.open('/helpdesk/WebObjects/Helpdesk.woa/wo/<*generated string*>','attachmentWindow','toolbar=no,location=no,status=no,menubar=no,resizable=no,scrollbars=no,top=250,left=250,width=350,height=175'); return false" href="/helpdesk/WebObjects/Helpdesk.woa/wo/<*generated string*>" class="roundRectButton"><div class="panelButton">Add File</div>

Once clicked, the pop-up window has 'Choose File' and 'Upload' buttons.

My issue is the default fontsize in the pop-up window. It's set to a low 11px by default. So I've changed it to a more reasonable 18px (we have older folks that work here). However, when doing so, as everything is bigger, it pushes the 'Upload' button out of the window because the window is too small. You would have to know there's a button over there, and scroll over to it, or manually resize the window. I'm designing for the lowest common denominator, so I can't assume they would know to look around for the button, nor would I consider it a great design choice.

I am struggling to target that 'attachmentWindow' node to edit, or even find it anywhere in any html, css, or js file.

I've tried some things and was able to add:

table > tbody > tr.upload_row > td.input_col {
    float: left;
}

table >tbody > tr.upload_row > td.action_col {
    float: left;
}

to whdStyles.css and that's gotten the Upload button to slide under the 'Choose File" button so it's in the window, but I'm still not in love with that. (See picture) CSS Edit for attachmentWindow

I've reached out to their Tech support to inquire how it might be done, or where to locate the code as this is my first experience with .woa, but they only told me it's impossible to change the font or window size as it's "hard-coded". I've already edited the font, so that leads to believe there might be a way.

Any ideas on how to resize that window?