.is-invalid, .is-invalid+.select2 .select2-selection{
    border-color: #ff0000 !important;
}

.form-group.required label:after {
    content: ' *';
    display:inline;
}

div.dt-buttons button.btn {
    margin-right: 5px;
}

div.btn-group-toggle > label.btn.btn-secondary {
    background-color: #efefef;
    color: #000000;
}

div.btn-group-toggle > label.btn.btn-secondary.active.disabled {
    background-color: #6c757d;
    color: #ffffff;
}