buzztone on "[Plugin: Contact Form 7] where to put border-collapse for table in form email"

I used Firebug o look at the HTML & CSS used for your CF7 form.

I can't see a HTML table in the Parts Required section of your form.

border-collapse:collapse; only works on HTML tables - see http://www.w3schools.com/cssref/pr_border-collapse.asp

Rather this area seems to be styled mainly as follows:

button, input, textarea {
border: 1px solid #CCCCCC;
border-radius: 3px 3px 3px 3px;
font-family: inherit;
padding: 0.428571rem;
}