.loader {
  position: relative;
  width: 80px;
  margin: 50px auto;
}

.duo {
  height: 20px;
  width: 50px;
  background: hsla(0, 0%, 0%, 0.0);
  position: absolute;
  
}

.duo, .dot {
  animation-duration: 0.8s;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
}

.duo1 {
  left: 0;
}

.duo2 {
  left: 30px
}


.dot {
  width: 20px;
  height: 20px;
  border-radius: 10px;
  background: #333;
  position: absolute;
}

.dot-a {
  left: 0px;
}

.dot-b {
  right: 0px;
}


@keyframes spin {
    0% { transform: rotate(0deg) }
   50% { transform: rotate(180deg) }
  100% { transform: rotate(180deg) }
}

@keyframes onOff {
    0% { opacity: 0; }
   49% { opacity: 0; }
   50% { opacity: 1; }
  100% { opacity: 1; }
}

.duo1 {
  animation-name: spin;
}

.duo2 {
  animation-name: spin;
  animation-direction: reverse;
}

.duo2 .dot-b {
  animation-name: onOff;
}

.duo1 .dot-a {
  opacity: 0;
  animation-name: onOff;
  animation-direction: reverse;
}

html {
  font-family: Verdana, sans-serif;
  font-size: 24px;
}

.address {
  font-size: 18px;
  text-decoration: line-through;
  text-decoration-color: red;  
}