.select2-container--bootstrap4 .select2-selection {
            border: 1px solid #ced4da;
            border-radius: 4px;
            height: 40px !important;
            padding: 0.375rem 0.75rem;
            font-size: 1rem;
            font-weight: 400;
            line-height: 1.8;
            color: #495057;
            background-color: #fff;
            background-clip: padding-box;
            transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
        }

        .select2-container--bootstrap4 .select2-selection--single {
            padding-top: 0.375rem;
            padding-bottom: 0.375rem;
        }

        .select2-container--bootstrap4 .select2-selection--single .select2-selection__arrow {
            height: calc(1.5em + 0.75rem + 2px);
            top: 0;
            right: 0.75rem;
        }

        .select2-container--bootstrap4.select2-container--focus .select2-selection {
            border-color: #80bdff;
            box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
        }

        .select2-container--bootstrap4.select2-container--open .select2-selection {
            border-color: #80bdff;
        }

        .select2-container--bootstrap4 .select2-dropdown {
            border-color: #80bdff;
            border-radius: 4px;
        }

        .select2-container--bootstrap4 .select2-results__option--highlighted[aria-selected] {
            background-color: #007bff;
            color: #fff;
        }

        .select2-container--bootstrap4 .select2-results__option[aria-selected=true] {
            background-color: #e9ecef;
        }

        /* Error State */
        .select2.is-invalid + .select2-container--bootstrap4 .select2-selection {
            border-color: #dc3545;
        }

        .select2.is-invalid + .select2-container--bootstrap4.select2-container--focus .select2-selection,
        .select2.is-invalid + .select2-container--bootstrap4.select2-container--open .select2-selection {
            border-color: #dc3545;
            box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
        }

        /* Placeholder color */
        .select2-container--bootstrap4 .select2-selection--single .select2-selection__placeholder {
            color: #6c757d;
        }