table.keys {
    border-collapse:collapse;
    font-size: 11pt;
    width: auto;
}

thead {
    background-color: #ffffff;
    color: #159957;
}

.required {
    background-color: #1599573d;
}

.optional {
    background-color: #fefefe;
}

img.os-compatiblity {
    border: 0;
    width: 10%;
    height: auto;
}

td.os-compatiblity {
    text-align: center;
}