* { box-sizing: border-box; }

html, body { margin: 0; width: 100%; height: 100%; }

body {
  background-color: #000;
  background-image:
    radial-gradient(white, rgba(255,255,255,.2) 2px, transparent 4px),
    radial-gradient(white, rgba(255,255,255,.15) 1px, transparent 3px),
    radial-gradient(white, rgba(255,255,255,.1) 2px, transparent 4px),
    radial-gradient(rgba(255,255,255,.4), rgba(255,255,255,.1) 2px, transparent 3px);
  background-size: 550px 550px, 350px 350px, 250px 250px, 150px 150px;
  background-position: 0 0, 40px 60px, 130px 270px, 70px 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: Arial, Helvetica, sans-serif;
  color: #c0c0c0;
}

.box {
  text-align: center;
  border: 6px ridge #808080;
  background: #111;
  padding: 30px 40px;
  max-width: 420px;
}

h1 {
  font-family: "Times New Roman", Times, serif;
  color: #ffff00;
  text-shadow: 2px 2px #ff0000;
  margin: 0 0 16px;
  font-size: 1.8em;
}

.blink {
  animation: blinker 1s linear infinite;
  color: #ff0000;
  font-weight: bold;
}

@keyframes blinker {
  50% { opacity: 0; }
}

p {
  line-height: 1.5;
}

a {
  color: #00ffff;
  font-family: "Courier New", Courier, monospace;
  text-decoration: none;
}

a:hover {
  color: #fff;
  text-decoration: underline;
}