.form-control-highlighted {
  border-color: $input-focus-border-color;

  transition: box-shadow 0.3s ease-in-out;
  animation: form-control-highlighted-blink 1s infinite;
}

@keyframes form-control-highlighted-blink {
  0% {
    box-shadow: 0 0 0 0 transparent;
  }

  50% {
    @if $enable-shadows {
      @include box-shadow($input-box-shadow, $input-focus-box-shadow);
    } @else {
      // Avoid using mixin so we can pass custom focus shadow properly
      box-shadow: $input-focus-box-shadow;
    }
  }

  100% {
    box-shadow: 0 0 0 0 transparent;
  }
}