style.css

body{
  font-family: sans-serif;
  margin: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: url("https://images.unsplash.com/photo-1503264116251-35a269479413?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1170&q=80");
  background-size: cover;
  overflow: hidden;
}

h2{
  text-transform: uppercase;
  letter-spacing: 4px;
  font-size: 26px;
  text-align: center;
  color: white;
}

.clock{
  display: flex;
  position: relative;
}

.clock div {
  margin: 5px;
}

.clock span {
  display: flex;
  width: 100px;
  height: 80px;
  background-color: rgb(67, 67, 170);
  opacity: .8;
  color: white;
  align-items: center;
  justify-content: center;
  font-size: 50px;
}

.clock .text {
  height: 30px;
  font-size: 10px;
  text-transform: uppercase;
  background-color: darkblue;
  opacity: .8;
}

.clock #am-pm {
  bottom: 0;
  position: absolute;
  width: 60px;
  height: 30px;
  font-size: 20px;
  background-color: black;
  margin-bottom: 4px;
}