card/merchant/assets/scss/lib/_select2.scss

.select2-container--default {
    .select2-selection--single {
        background-color: #f6f7fc;
        border: 1px solid $border !important;
    }
    &.select2-container--focus .select2-selection--multiple {
        background-color: $white;
        border: 1px solid #9ca3b1;
        outline: 0;
        box-shadow: none;
    }
    .select2-selection--multiple {
        background-color: #f6f7fc;
        border: 1px solid $border !important;
        cursor: text;
    }
    .select2-search--dropdown .select2-search__field {
        border: 1px solid $border !important;
    }
    .select2-selection--multiple {
        .select2-selection__choice,
        .select2-selection__choice__remove {
            color: $white !important;
        }
    }
    .select2-results>.select2-results__options {
        box-shadow: 0px 16px 18px rgba(104, 113, 123, .2);
    }
}

.select2-container .select2-selection--single {
    height: 2.375rem !important;
}

.select2-container--default .select2-selection--single {
    outline: none;
    .select2-selection__rendered {
        color: #444;
        line-height: 36px !important;
    }
    .select2-selection__arrow {
        height: 2.375rem !important;
        inset-inline-end: 9px !important;
    }
}

.select2-dropdown {
    z-index: 6 !important;
}