html, body {
    height: 100%;
}

body {
    margin: 0;
}

.flex-container {
    height: 100%;
    padding: 0;
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.row {
    width: auto;
}

.flex-item {
    text-align: center;
}