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-1500382017468-9049fed747ef?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1332&q=80);
    background-size: cover;
    overflow: hidden;/* para tirar a barra de rolagem da lateral caso tenha*/
}

h2{
    text-transform: uppercase;/*caixa alta de texto*/
    letter-spacing: 4px;/*espaço entre as letras*/
    font-size: 14px;/*tamanho das letras*/
    text-align: center;/*faz o conteúdo ficar fixo no centro da tela*/
    color: white;
}   

.clock{
    display: flex;
}

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

.clock span{
    width: 100px;
    height: 80px;
    background: #8B4513;
    opacity: .8;
    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: 30px;
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 2px;
    background: #462309;
    opacity: 0.8;
}

.clock #ampm{
    bottom: 0;
    position: absolute;
    width: 60px;
    height: 30px;
    font-size: 20px;
    background: #8B0000;
}