*{
  margin: 0;
  padding: 0;
}

body{
  font-family: Arial, Helvetica, sans-serif;
  background-color: #abc;
  line-height: 1.6;
  text-align: center;
}

.container{
  max-width: 960px;
  margin: auto;
  padding: 0 30px;
}

#showcase{
  height: 300px;
}

#showcase h1{
  font-size: 50px;
  line-height: 1.3;
  position: relative;

  animation-name: heading;
  animation-duration: 3s;
  animation-fill-mode: forwards;
}

@keyframes heading {
  0%{top: -50px;}
  100%{top: 200px;}
}

#content{
  position: relative;

  animation-name: content;
  animation-duration: 3s;
  animation-fill-mode: forwards;
}

@keyframes content {
  0%{left: -1000px;}
  100%{left: 0;}
}

.btn{
  display: inline-block;
  color: #6e6e6e;
  text-decoration: none;
  padding: 16px 32px;
  border: #6e6e6e 1px solid;
  border-radius: 3px;
  margin: 40px 10px 10px 10px;
  opacity: 0;

  animation-name: btn;
  animation-duration: 3s;
  animation-delay: 2s;
  animation-fill-mode: forwards;

  transition-property: transform;
  transition-duration: 1s;
}

.btn:hover{
  transform: rotateY(180deg);
}

@keyframes btn {
  0%{opacity: 0;}
  100%{opacity: 1;}
}