.exito {
    background-color: lightgreen;
    padding: 1em;
}

.error {
    background-color: tomato;
    padding: 1em;
}
.d-flex table {
    margin:1em 2em;
}
.col-3 {
    text-align:right;
}
input:invalid {
    border: 2px solid red;
}

input:invalid:required {
    border: 2px solid red;
}

input:valid {
    border: 2px solid green;
}
.txiki table{
    padding: .1rem .1rem;
}