.input-group > .intl-tel-input.allow-dropdown {
    -webkit-box-flex: 1;
    -ms-flex: 1 1 auto;
    flex: 1 1 auto;
    width: 1%;
}

.input-group > .intl-tel-input.allow-dropdown > .flag-container {
    z-index: 4;
}

.iti-flag {
    background-image: url("https://cdnjs.cloudflare.com/ajax/libs/intl-tel-input/12.1.6/img/flags.png");
}

@media only screen and (-webkit-min-device-pixel-ratio: 2), only screen and (min--moz-device-pixel-ratio: 2), only screen and (-o-min-device-pixel-ratio: 2 / 1), only screen and (min-device-pixel-ratio: 2), only screen and (min-resolution: 192dpi), only screen and (min-resolution: 2dppx) {
    .iti-flag {
        background-image: url("https://cdnjs.cloudflare.com/ajax/libs/intl-tel-input/12.1.6/img/flags@2x.png");
    }
}