.divider:after, .divider:before {
    flex: 1;
    height: 1px;
    background: #eee;
}

.h-custom {
    height: calc(100% - 73px);
}

.invalid {
    border: 1px solid red;
}

@media (max-width: 450px) {
    .h-custom {
        height: 100%;
    }
}