.error {
    display: block;
    font: 11px Arial, Helvetica, sans-serif;
    color: #e9222d;
    margin-top: -6px;
}

.form-control.error {
    border: 1px solid #e9222d;
    background: #fde0e2;
    padding: 6px 12px;
    font-size: 14px;
    line-height: 1.42857;
}