body {
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  font-size: 1.3rem;
}
#overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.75);
  z-index: 0;
}
.container {
  position: relative;
  z-index: 1;
}
#countdown {
  font-size: 2rem;
  font-weight: bold;
}
.timer-info {
  font-size: 1.6rem;
  line-height: 2.2rem;
}