#package_id-content {
    display: flex;
    flex-wrap: wrap;
    padding-top: 5px;
}
#package_id-content .btn {
    padding: 5px 10px;
    border: 2px solid #ffffff;
    margin: 0px 5px 3px 5px;
    flex: 1;
    opacity: 0.8;
}
#package_id-content .btn.selected {
    border: 2px solid #097FC6;
    opacity: 1;
}
#package_id-content.invalid_value {
    background: #ffdcdc;
}
#package_id-content .error {
    width: 100%;
    text-align: center;
}
@media (max-width: 575px) {
    #package_id-content .btn {
        font-size: 0.9rem;
    }
}
@media (max-width: 360px) {
    #package_id-content .btn {
        font-size: 0.8rem;
    }
}