form#sfwd-mark-complete input[type="submit"] {
    background-color: #44c767;
    border-radius: 11px;
    border: 1px solid #18ab29;
    display: inline-block;
    cursor: pointer;
    color: #ffffff;
    font-family: Arial;
    font-size: 17px;
    padding: 16px 31px;
    text-decoration: none;
    text-shadow: 0px 1px 0px #2f6627;
}

form#sfwd-mark-complete input[type="submit"]:hover {
    background-color: #5cbf2a;
}

form#sfwd-mark-complete {
    display: flex;
    justify-content: center;
    align-items: center;
}