Alignment of form fields

You have a greedy CSS selector .sidebar making the sidebar form 31% wide…

style.css:450

.footer-widgets-1, .footer-widgets-2, .footer-widgets-3, .sidebar, .subnav-left, #header .widget-area {
width: 31.111111111%;
}

Either tweak that selector to not apply to that sidebar, or manually set the salesforce widget width.

e.g.

.w2llead.sidebar{
width: 100%;
}