body {
  font-family:"Orbitron",sans-serif;
  background-color:#121212;
}

.header {
  font-size: 70px;
  color: #ffd700;
}

.main {
  font-size: 18px;
  color: #ffd700;
}

.contents {
  font-size:30px;
  height: 500px;
  margin-top: 100px;
}

.contents-item img{
  width:400px;
  display:inline-block;
  margin-right:20px;
}