body{
  background:#d1ffd6;
  text-align:center;
  font-family:Arial;
}
header{
  background:#2ecc71;
  color:white;
  padding:40px;
  font-size:30px;
}
section{
  margin-top:60px;
  font-size:22px;
}
.back{
  display:inline-block;
  margin:20px;
  background:#ff7a00;
  color:white;
  padding:10px 15px;
  text-decoration:none;
  border-radius:5px;
}
body{
  animation: fadebg 1s;
}

@keyframes fadebg{
  from{
    opacity:0;
  }
  to{
    opacity:1;
  }
}

h1{
  animation: pop 0.8s;
}

@keyframes pop{
  from{
    transform: scale(0.7);
    opacity:0;
  }
  to{
    transform: scale(1);
    opacity:1;
  }
}