Submit Button

Hi,
your plugin works very great so far! Thank you very very much!!!

1) can i place my submit button (with customization style) on center of my form, not in the end of second column (?)

2) i get error with “This field is required.” on radio button like this http://snag.gy/hwigM.jpg

3) i use this css, but not result anymore
div.ss-form-entry>input[type=”submit”][name=”submit”] { background-color: #38b7ee; }

div.errorbox-bad div.ss-item-required label {
color: red;
}

please check my form here : http://www.ppmmiftahulkhoir.com/v2/form-database-alumni/

Thank you for your help
http://ww.wp.xz.cn/plugins/wpgform/