* {
    font-family: "Microsoft JhengHei";
}

.dropdown-item-20 {
    height: 20px;
}
.dropdown-taiwan-flag-32::before { content: url(../Content/images/taiwan_flag_32.png); }
.dropdown-taiwan-flag-16::before { content: url(../Content/images/taiwan_flag_16.png); }

.dropdown-china-flag-32::before { content: url(../Content/images/china_flag_32.png); }
.dropdown-china-flag-16::before { content: url(../Content/images/china_flag_16.png); }

.dropdown-usa-flag-32::before { content: url(../Content/images/usa_flag_32.png); }
.dropdown-usa-flag-16::before { content: url(../Content/images/usa_flag_16.png); }

.dropdown-japan-flag-32::before { content: url(../Content/images/japan_flag_32.png); }
.dropdown-japan-flag-16::before { content: url(../Content/images/japan_flag_16.png); }

.dropdown-vietnam-flag-32::before { content: url(../Content/images/vietnam_flag_32.png); }
.dropdown-vietnam-flag-16::before { content: url(../Content/images/vietnam_flag_16.png); }

.dropdown-usa-flag-32::before { content: url(../Content/images/usa_flag_32.png); }
.dropdown-usa-flag-16::before { content: url(../Content/images/usa_flag_16.png); }

.dropdown-korea-flag-32::before { content: url(../Content/images/korea_flag_32.png); }
.dropdown-korea-flag-16::before { content: url(../Content/images/korea_flag_16.png); }