Answer: Animated border unwanted delay

#neki {
  padding: 10px;
  border: 6px solid #dcdcdc;
  animation: example 1s infinite;
}

@keyframes example {
  0%,
  100% {
    border-top-color: red;
    border-right-color: #dcdcdc;
  }
  25% {
    border-right-color: red;
    border-bottom-color: #dcdcdc;
  }
  50% {
    border-bottom-color: red;
    border-left-color: #dcdcdc;
  }
  75% {
    border-left-color: red;
    border-top-color: #dcdcdc;
  }
}