.hamburger {
  padding: 0 10px;
  order: 1;
}
.hamburger .line {
  width: 30px;
  height: 3px;
  background-color: #ecf0f1;
  display: block;
  margin: 10px auto;
  -webkit-transition: all 0.3s ease-in-out;
  -o-transition: all 0.3s ease-in-out;
  transition: all 0.3s ease-in-out;
}
.hamburger.is-active .line:nth-child(2) {
  opacity: 0;
}
.hamburger.is-active .line:nth-child(1){
  -webkit-transform: translateY(13px) rotate(45deg);
  -ms-transform: translateY(13px) rotate(45deg);
  -o-transform: translateY(13px) rotate(45deg);
  transform: translateY(13px) rotate(45deg);
}
.hamburger.is-active .line:nth-child(3){
  -webkit-transform: translateY(-13px) rotate(-45deg);
  -ms-transform: translateY(-13px) rotate(-45deg);
  -o-transform: translateY(-13px) rotate(-45deg);
  transform: translateY(-13px) rotate(-45deg);
}
@media (max-width: 899px) {
  #main-navigation {
    max-height: 100vh;
    overflow-y: scroll;
  }
}
@media (min-width: 900px) {
  .hamburger {
    display: none;
  }
}