safaribook-pro-aspnet-mvc5/SportsStore/SportsStore.WebUI/Content/ErrorStyles.css

.field-validation-error     {
    color: #f00;
}

.field-validation-valid     {
    display: none;
}

.input-validation-error     {
    border: 1px solid #f00;
    background-color: #fee;
}

.validation-summary-errors {
    font-weight: bold;
    color: #f00;
}

.validation-summary-valid   {
    display: none;
}