#nav-1 {
  position: relative;
  border: none;
  border-radius: 10em;
  display: flex;
  list-style: none;
  background: #f5f5f5;
  box-shadow: 20px 40px 40px #00000033;
  padding: 10px;
  width: 50%;
  text-align: center;
  margin: 0 auto;
  
}
#nav-1 li {
  margin: 0px;
}
#nav-1 li a {
  position: relative;
  padding: 0.6em 2em;
  font-size: 18px;
  border: none;
  outline: none;
  color: #333;
  display: inline-block;
  text-decoration: none;
  z-index: 3;

}
#nav-1 .slide1,
#nav-1 .slide2 {
  position: absolute;
  display: inline-block;
  height: 3em;
  border-radius: 10em;
  transition: all 0.6s cubic-bezier(0.23, 1, 0.32, 1.05);
}
#nav-1 .slide1 {
  background-color: #9ec2d9;
  z-index: 2;
}
#nav-1 .slide2 {
  opacity: 0;
  background: #ddd;
  z-index: 1;
}
#nav-1 .squeeze {
  transform: scale(0.9);
}