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-1499002238440-d264edd596ec?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1470&q=80");
   background-size: cover;
   overflow: hidden;
}

h2 {
   text-transform: uppercase;
   letter-spacing: 4px;
   font-size: 30px;
   text-align: center;
   color: white;
}

.clock {
   display: flex;
}

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

.clock span {
   width: 100px;
   height: 80px;
   background: rgb(192, 205, 90);
   opacity: 0.8;
   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: darkblue;
   opacity: 0.8;
}

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