.centredOnPage {
    position: absolute;
    top: 40%;
    left: 50%;
    margin-right: -50%;
    transform: translate(-50%, -50%)
}
.centredOnPage p {
    text-align: center;
}

.mainMessage {
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    font-size: 32px;
}

.subMessage {
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    font-size: 24px;
    color: gray;
}

.errorMessage {
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    font-size: 32px;
    color: red;
}