.birthdaypicker .birthdaypicker-select {
    width: auto;
    display: inline-block;
}

.birthdaypicker .birthdaypicker-select-first {
    border-radius: 4px 0 0 4px;
}

.birthdaypicker .birthdaypicker-select-second {
    border-radius: 0;
    position: relative;
    left: -1px;
}

.birthdaypicker .birthdaypicker-select-third {
    border-radius: 0 4px 4px 0;
    position: relative;
    left: -2px;
}