Hi there,
you can try this CSS to force the form to fill the width of the content:
#page .ja-gadget-virtual-assistant-inline.cleanslate .th-chat-window-inline .modal.size-450x400 {
width: 100% !important;
}
Or instead use this CSS to center it in the page:
#page .ja-gadget-virtual-assistant-inline.cleanslate .th-chat-window-inline .modal.size-450x400 {
margin-left: auto !important;
margin-right: auto !important;
}
the !important
statement is necessary as the plugins CSS is using them 🙁