.draw-border {
  overflow: hidden;
  position: relative;
}
.draw-border::before, .draw-border::after {
  content: '';
  box-sizing: border-box;
  position: absolute;
  border: 2px dotted transparent;
  width: 0;
  height: 0;
}
.draw-border::before {
  top: 0;
  left: 0;
  border-top-color: red;
  border-right-color: red;
  animation: border 2s infinite;
}
.draw-border::after {
  bottom: 0;
  right: 0;
  animation: border 2s 1s infinite, borderColor 2s 1s infinite;
}

@keyframes border {
  0% {
    width: 0;
    height: 0;
  }
  25% {
    width: 100%;
    height: 0;
  }
  50% {
    width: 100%;
    height: 100%;
  }
  100% {
    width: 100%;
    height: 100%;
  }
}
@keyframes borderColor {
  0% {
    border-bottom-color: red;
    border-left-color: red;
  }
  50% {
    border-bottom-color: red;
    border-left-color: red;
  }
  51% {
    border-bottom-color: transparent;
    border-left-color: transparent;
  }
  100% {
    border-bottom-color: transparent;
    border-left-color: transparent;
  }
}