.column-tarif {
    width: 20%;
}

.row {
    display: flex;
}

.row .col-6 {
    width: calc(50% - 5px);
    margin-right: 10px;
}
.row .col-6:last-child {
    margin-right: 0px;
}

.form-group {
    padding-bottom: 10px;
}

.form-group label {
    display: block;
    padding-bottom: 5px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 5px;
}

.form-group input[type="date"],
.form-group input[type="number"] {
    width: auto;
    padding: 1px;
}

@media screen and (max-width: 500px) {
    [class^="col-6"] {
        width: 100%;
    }
}