.disabled-select {
    background-color: #d5d5d5;
    opacity: 0.5;
    border-radius: 3px;
    cursor: not-allowed;
    position: absolute;
    top: 0;
    bottom: 0;
    right: 0;
    left: 0;
}

select[readonly].select2-hidden-accessible + .select2-container {
    pointer-events: none;
    touch-action: none;
    background-color: #f7f7f7 !important;
}

    select[readonly].select2-hidden-accessible + .select2-container .select2-selection {
        background: #eee;
        box-shadow: none;
        background-color: #f7f7f7 !important;
    }

    select[readonly].select2-hidden-accessible + .select2-container .select2-selection__arrow,
    select[readonly].select2-hidden-accessible + .select2-container .select2-selection__clear {
        display: none;
        background-color: #f7f7f7 !important;
    }