body {
  margin: 0;
  height: 100vh;
  background: #000;
  overflow: hidden;
  font-family: monospace;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.flash-colors {
  position: fixed;
  inset: 0;
  background: transparent;
  pointer-events: none;
  z-index: 1;
  animation: randomColorFlashes 8s infinite;
}

.content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 2rem;
}

.content h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.content p {
  font-size: 1rem;
  opacity: 0.8;
  margin-bottom: 2rem;
}

.home-link {
  color: #0ff;
  text-decoration: none;
  border: 1px solid #0ff;
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  transition: background .3s, color .3s;
}

.home-link:hover {
  background: #0ff;
  color: #000;
}

@keyframes randomColorFlashes {
  0%, 98%, 100% {
    background-color: transparent;
  }
  1% {
    background-color: rgba(255, 0, 0, 0.7);
  }
  3% {
    background-color: transparent;
  }
  20% {
    background-color: rgba(0, 255, 0, 0.7);
  }
  22% {
    background-color: transparent;
  }
  50% {
    background-color: rgba(0, 0, 255, 0.7);
  }
  52% {
    background-color: transparent;
  }
  75% {
    background-color: rgba(255, 255, 0, 0.7);
  }
  77% {
    background-color: transparent;
  }
}

.en {
  display: block;
  font-size: 0.9em;
  opacity: 0.7;
  margin-top: 0.3rem;
}