.content-wrapper {
    height: 80vh; min-height: 50vh; max-height: 90vh;
    display: flex;
    flex-flow: column nowrap;
    align-items: center;
    justify-content: center;
}

.countdown {
    text-align: center;
    margin: 1em auto;
}

.countdown > span {
    display: inline-block;
    font-size: 2em;
    padding: 1em;
    text-transform: uppercase;
}

.countdown > span > span {
    display: block;
    font-size: 5rem;
    font-weight: bold;
}