#nav-icon {
  width: 46px;
  height: 46px;
  -webkit-transform: rotate(0deg);
  -moz-transform: rotate(0deg);
  -o-transform: rotate(0deg);
  transform: rotate(0deg);
  -webkit-transition: .5s ease-in-out;
  -moz-transition: .5s ease-in-out;
  -o-transition: .5s ease-in-out;
  transition: .5s ease-in-out;
  cursor: pointer;
  z-index: 1000;
  -webkit-appearance: none;
  background: #133a22;
  color: #fff;
  overflow: hidden;
  padding: 0;
  border-radius: 3px;
  border: 1px solid #133a22;
}

#nav-icon.open-menu {
  background: #133a22;
  box-shadow: 0 0 10px #fff;
}

#nav-icon>.lines {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  -ms-flex-wrap: wrap;
  flex-wrap: wrap;
  margin: 0 auto;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -ms-flex-direction: column;
  flex-direction: column;
  left: 0;
  width: 15px;
  -webkit-transition: all .5s ease-out;
  transition: all .5s ease-out;
}

#nav-icon>.lines .line {
  width: 100%;
  height: 1px;
  border-radius: 2px;
  background-color: #fff;
  margin: 2px 0;
  -webkit-transform-origin: top left;
  transform-origin: top left;
  -webkit-transition: all .5s ease-out;
  transition: all .5s ease-out;
}

#nav-icon:focus {
  outline: none;
}