body {
  background: url('https://www.toptal.com/designers/subtlepatterns/patterns/dark-mosaic.png');
  color: lime;
  font-family: "Comic Sans MS", cursive;
  text-align: center;
  margin: 0;
  padding: 0;
}

.headline {
  font-size: 28px;
  color: yellow;
  background: blue;
  padding: 15px;
  font-weight: bold;
}

.container {
  border: 5px dashed red;
  margin: 30px auto;
  padding: 20px;
  width: 80%;
  background-color: black;
}

a {
  color: hotpink;
  font-weight: bold;
  text-decoration: underline;
}
b {
  color: cyan;
  font-weight: bold;
  text-decoration: underline;
}
c {
  color: yellow;
  font-weight: bold;
  text-decoration: underline;
}

.blinking {
  animation: blinker 1s linear infinite;
  color: cyan;
}

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

footer {
  margin-top: 40px;
  font-size: 14px;
  background-color: #111;
  padding: 10px;
  border-top: 2px dotted lime;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.cover-img {
  width: 600px;   /* oder z.B. 50% */
  height: auto;
}