*{
    box-sizing: border-box;
}
body{
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    background-image: url("https://picsum.photos/id/667/600/400");
    background-repeat: no-repeat;
    background-size:cover;
    color: black;
}

.countdown{
    display: flex;
    justify-content: center;
    align-content: center;
    text-align: center;
    margin: 30px;
    }

div {
    margin: 30px;  
}