body{
    margin: 0;
    font-family: sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100vh;
    justify-content: center;
    background: url("https://images.unsplash.com/photo-1497215842964-222b430dc094?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxzZWFyY2h8MTV8fGhhY2tlcnxlbnwwfDB8MHx8&auto=format&fit=crop&w=500&q=60");
    background-size: cover;
    overflow: hidden;
}

h2{
    text-transform: uppercase;
    letter-spacing: 4px;
    font-size: 19px;
    text-align: center;
    text-shadow: 2px 2px 4px rgba(0,0,0,.3);
}

.clock{
    display: flex;
}

.clock div{
    margin: 5px;
    position: relative;
}

.clock span{
    width: 100px;
    height: 80px;
    background-color: none;
    opacity: .8;
    color: black;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 50px;
    text-shadow: 2px 2px 4px rgba(0,0,0,.3);
}

.clock .text{
    height: 30px;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 2px;
    background: #dfd9c7;
    opacity: .8;
}