body {
  font-family: 'Courier New', Courier, monospace;
  background-color: #000;
  color: #f5f5f5;
  text-align: center;
  position: relative;
  overflow: hidden;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: transparent;
  z-index: -1;
  pointer-events: none;
  background-image: radial-gradient(white 1px, transparent 1px),
    radial-gradient(white 1px, transparent 1px);
  background-size: 30px 30px;
  background-position: 0 0, 15px 15px;
  opacity: 0.2;
}

.container {
  background-color: rgba(85, 85, 85, 0.8);
  padding: 30px;
  border: 2px dotted #f5f5f5;
  display: inline-block;
}

h1 {
  font-size: 3em;
  font-family: 'Comic Sans MS', 'Chalkboard SE', 'Comic Neue', cursive, sans-serif;
  background: linear-gradient(90deg, red, orange, yellow, green, blue, indigo, violet, red);
  background-size: 200% 100%;
  background-clip: text;
  color: transparent;
  animation: rainbow 10s infinite linear;
}

@keyframes rainbow {
  0% {
    background-position: -100% 0;
  }

  100% {
    background-position: 100% 0;
  }
}