body {
    padding: 10px;
    margin: 0;
    background: #ffe;
}

.rsvp {
    font-family: Helvetica, sans-serif;
    border: 1px solid black;
    font-size: large;
    width: 35%;
    padding: 10px;
}

.top {
    font-size: x-large;
    text-align: center;
}

.bottom {
    text-align: center;
    font-size: small;
}

.error {
    color: red;
}