.validation-summary-errors {
    border: solid 1px red;
    background-color: #fee;
    border-radius: 5px;
    margin: 10px;
    padding: 10px;
}

.validation-summary-errors ul {
    margin: 0; padding: 0; list-style: none;
}
.validation-summary-errors li {
    color: red;
}