.iti.mp-phone-prefix-field {
    width: 100%;
}

.iti.mp-phone-prefix-field input {
    width: 100%;
}

.iti.mp-phone-prefix-field .mp-phone-prefix-dial-code {
    color: currentColor;
    font-variant-numeric: tabular-nums;
    margin-left: 0.35rem;
    white-space: nowrap;
}