.contact {
    margin: 8em 0 0;
}
.thanks {
    margin-top: 8em;
    margin-bottom: 10%;
}
.back {
    text-align: center;
    margin-bottom: 10%;
}


@media screen and (max-width:480px){
	form#mail_form p#form_submit {
		text-align: center;
	}
}