styles.css

/*Removing the default margin and bringing everything to the center*/
body{
    margin: 0;
    display: flex;
    font-family: sans-serif;
    flex-direction: column;
    align-items: center; /*center horizontally*/
    height: 100vh;
    justify-content: center; /*center vertically*/
    background: url(https://images.unsplash.com/photo-1475924156734-496f6cac6ec1?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1170&q=80);
    background-repeat: no-repeat;
    background-size: cover;
    overflow: hidden; /* no scrollbar*/
}

h2{
    text-transform: uppercase;
    letter-spacing: 4px;
    font-size: 16px;
    text-align: center;
}

.clock{
    display: flex;

    
}

.clock div{
    margin: 6px;
    position: relative;
}

.clock span{
    width: 100px;
    height: 80px;
    background-color: blueviolet;
    opacity: 60%;
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 50px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);

}

.clock .text{
    height: 40px;
    font-size: 15px;
    text-transform: uppercase;
    letter-spacing: 2px;
    background: darkblue;
    opacity: 80%;
}

.clock #ampm{
    bottom:0;
    position:absolute;
    width: 70px;
    height: 40px;
    font-size: 20px;
    background: green;
}