body {
  background: #000;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

.link-url {
  color: #ffffff;
  font-size: 12px;
  text-decoration: underline;
  font-family: Arial, Helvetica, sans-serif;
}
.link-url:hover {
  -webkit-animation: link-url 1s infinite;
  -moz-animation: link-url 1s infinite;
  animation: link-url 1s infinite;
}
@-webkit-keyframes link-url {
  0% {
    color: #ff0000;
  }
  10% {
    color: #ff8000;
  }
  20% {
    color: #ffff00;
  }
  30% {
    color: #80ff00;
  }
  40% {
    color: #00ff00;
  }
  50% {
    color: #00ff80;
  }
  60% {
    color: #00ffff;
  }
  70% {
    color: #0080ff;
  }
  80% {
    color: #0000ff;
  }
  90% {
    color: #8000ff;
  }
  100% {
    color: #ff0080;
  }
}
@-moz-keyframes link-url {
  0% {
    color: #ff0000;
  }
  10% {
    color: #ff8000;
  }
  20% {
    color: #ffff00;
  }
  30% {
    color: #80ff00;
  }
  40% {
    color: #00ff00;
  }
  50% {
    color: #00ff80;
  }
  60% {
    color: #00ffff;
  }
  70% {
    color: #0080ff;
  }
  80% {
    color: #0000ff;
  }
  90% {
    color: #8000ff;
  }
  100% {
    color: #ff0080;
  }
}
@keyframes link-url {
  0% {
    color: #ff0000;
  }
  10% {
    color: #ff8000;
  }
  20% {
    color: #ffff00;
  }
  30% {
    color: #80ff00;
  }
  40% {
    color: #00ff00;
  }
  50% {
    color: #00ff80;
  }
  60% {
    color: #00ffff;
  }
  70% {
    color: #0080ff;
  }
  80% {
    color: #0000ff;
  }
  90% {
    color: #8000ff;
  }
  100% {
    color: #ff0080;
  }
}

.breaker {
  display: none;
}
.breaker:nth-child(3n) {
  display: block;
  width: 100%;
  height: 0;
}