.page {
    position: absolute;
    width: 100%;
    height: 100%;
    display: table;
    margin: 0;
    padding: 0;
}

.post {
    display: table-cell;
    vertical-align: middle;
    padding: .5rem;
}

.post > form {
    max-width: 740px;
    margin: 1rem auto;
}

.post > div {
    display: flex;
    justify-content: center;
    margin: 1rem auto;
}