.iti {
    width: 100%;
    display: block;
}
.iti__flag {
    background-image: url("https://cdnjs.cloudflare.com/ajax/libs/intl-tel-input/17.0.8/img/flags.png");
}
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .iti__flag {
        background-image: url("https://cdnjs.cloudflare.com/ajax/libs/intl-tel-input/17.0.8/img/flags@2x.png");
    }
}