.callback-modal {
    max-width: 900px;
}

    .callback-modal textarea {
        max-width: 100%;
        min-width: 100%;
        max-height: 300px;
        min-height: 100px;
    }

    .callback-modal .final-text {
        text-align: center;
    }

.adv-modal .adv-modal-inner.callback-dialog,
.adv-modal-floating .adv-modal-inner.callback-dialog {
    min-width: 35vw;
    max-width: 35vw;
}