.webform-submission-form {
    padding-top: 136px;
}
...changed to...
.webform-submission-form {
    padding-top: 10px;
}


.two-columns-container, .user-login, .webform-submission-form {
    padding-bottom: 20px;
    min-height: 600px;
}
...changed to...
.two-columns-container, .user-login, .webform-submission-form {
    padding-bottom: 20px;
    min-height: 100px;
}