body {
  background: url("stars.GIF") repeat;
  color: lime;
  font-family: "Comic Sans MS", "Courier New", sans-serif;
  margin: 0;
  padding: 0;
}

a {
  color: yellow;
  text-decoration: none;
}
a:hover {
  color: pink;
  text-decoration: underline;
}

table.nav {
  width: 100%;
  background: purple;
  text-align: center;
  border: 2px solid yellow;
}
table.nav td {
  padding: 10px;
  font-weight: bold;
}

div.content {
  background: rgba(0, 0, 0, 0.6);
  border: 3px dashed hotpink;
  margin: 20px;
  padding: 15px;
}

.blink {
  animation: blinker 1s step-start infinite;
}

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