Question

I am trying to force this form element to expand to 957px. Here is the page.
https://www.whiteribbonalliance.org/index.cfm/donate-usd

Answer 1

If you remove this you will have a chance to expand it:

style.css:57:

#primary form {
    ...
    max-width: 504px;
}

max-width, as its name implies, tells the maximum width that the element can have.

I found it by simply using the Chrome Inspector.