.phone-validation-error {
    display: block;
    margin: 6px 0 0;
    color: #a52c24;
    font-size: 12px;
    line-height: 1.5;
    text-align: left;
}
.phone-validation-error[hidden] { display: none; }
input[name="phone"][aria-invalid="true"] { border-color: #a52c24 !important; }