main input.first {
    margin-bottom: -1px;
    border-bottom-right-radius: 0;
    border-bottom-left-radius: 0;
}

main input.middle {
    margin-bottom: -1px;
    border-bottom-right-radius: 0;
    border-bottom-left-radius: 0;
    border-top-left-radius: 0;
    border-top-right-radius: 0;
}

main input.last {
    margin-bottom: 10px;
    border-top-left-radius: 0;
    border-top-right-radius: 0;
}