Hi There,
There are unexpected semi-colon in your custom CSS. Please update your custom CSS to this:
body #gform_wrapper_4 .gform_body .gform_fields .gfield input[type=text] {
border-style: solid;
border-width: 0px 0px 1px 0px;
box-shadow: none;
border-radius: 0px !important
}
body .gform_body .gform_fields .gfield textarea {
border-style: solid;
border-width: 0px 0px 1px 0px;
box-shadow: none;
border-radius: 0px;
}
body .gform_footer input.button,
body .gform_footer input[type=submit] {
border-radius: 25px;
padding-top: 10px;
padding-bottom: 10px;
padding-left: 25px;
padding-right: 25px;
}
body .gform_wrapper .gform_body input {
font-size: 20px;
}
Hope it helps 