center form on external web page

I cannot get my form on my sidebar to be centered and I would like the input areas to be wider--to fill up the whole white box.

Please view my url and help me

Thanks!

Please inject the following CSS to your form:

.form-line {
padding-left: 18px;
}

Then, set the Submit Button Align to Center:

I hope it will fix the issue. If you need any further assistance, please let us know.