Form Fields Display in All Browsers but IE (Internet Explorer)

The form found at https://sweet200.com/appt seems to be working (other than the button style not displaying correctly) in all browsers but IE (Internet Explorer) – I tested in IE 9 and IE 8 on Windows.

This is the custom CSS that should be overriding the stylesheet.

/* CONTACT FORM */

input[type=text], input[type=password], input[type=email], textarea, select {
    -moz-box-sizing: border-box;
    background: none repeat scroll 0 0 #CCCCCC;
    border: 1px solid #777777;
    color: #777777;
    padding: 10px;
    width: 100%;
    margin: 0 0 35px;
} 

input[type=text], input[type=password], input[type=email], textarea, select {
    color: #777777;
    font: 15px "HelveticaNeue","Helvetica Neue",Helvetica,Arial,sans-serif;
    display: table-column;
    margin-bottom: 15px;
}

.post-content p {
    font-size: 16px;
}

span.service {
    height: 250px;
}

span.wpcf7-list-item {
    margin-left: 0em;
    line-height: 2em;
    float:left; width:50%;
}

.wpcf7-form p select {
-moz-box-sizing: border-box;
background: none repeat scroll 0 0 #CCC;
border: 1px solid #777;
padding: 10px;
width: 100%;
margin: 0 0 35px;

}

https://www.ads-software.com/extend/plugins/contact-form-7/