body{
  margin:0;
  background:#000;
  color:#00ff88;
  font-family:monospace;
}

header{
  padding:15px;
  border-bottom:1px solid #00ff88;
}

nav{
  display:flex;
  gap:15px;
  padding:10px;
  border-bottom:1px solid #003322;
}

a{
  color:#00ff88;
  text-decoration:none;
}

.container{
  padding:20px;
}

.ad-320{
  width:320px;
  height:100px;
  margin:20px auto;
}