body {
    background: #f7fafc;
}
.card {
    box-shadow: 0 3px 14px #0002;
}
input:invalid, input:focus:invalid {
    border-color: #dc3545;
}
.form-label {
    font-weight: 500;
}
.btn-primary, .btn-success, .btn-warning {
    box-shadow: 0 2px 6px #0001;
}