section{
  width: 100%;
  height: 30vh;
}

.center-content{
  display: flex;
  justify-content: center;
  align-items: center;
}

.odd{
  height: 65vh;
}

.one{
  background: url('https://hd.unsplash.com/photo-1470897655254-05feb2d2ab97');
  background-attachment: fixed;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;

}
.scroll-down{
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 30%;
  width: 15%;
  background: black;
  color: white;
  font-size: 200%;

}

.two{

}

.three{
  background: url('https://hd.unsplash.com/photo-1468852747768-9d51ceb4422d');
  background-attachment: fixed;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;

}

.four{

}

.five{
  background: url('https://hd.unsplash.com/photo-1465281508053-aee07fc08957');
  background-attachment: fixed;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}

.six{

}

.seven{
  background: black;
  color: white;
}