#nav-icon span:nth-child(1) {
  top: 0px;
}

#nav-icon span:nth-child(2),
#nav-icon span:nth-child(3) {
  top: 10px;
}

#nav-icon span:nth-child(4) {
  top: 20px;
}

#nav-icon.open span:nth-child(1) {
  top: 11px;
  width: 0%;
  left: 50%;
}

#nav-icon.open span:nth-child(2) {
  transform: rotate(45deg);
}

#nav-icon.open span:nth-child(3) {
  transform: rotate(-45deg);
}

#nav-icon.open span:nth-child(4) {
  top: 11px;
  width: 0%;
  left: 50%;
}


#nav-icon {
  width: 38px;
  height: 28px;
  position: relative;
  margin: 8px auto;
  transform: rotate(0deg);
  transition: .5s ease-in-out;
  cursor: pointer;
}

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

#nav-icon span {
  display: block;
  position: absolute;
  height: 3px;
  width: 100%;
  border-radius: 8px;
  background: #000040;
  opacity: 1;
  left: 0;
  transform: rotate(0deg);
  transition: .25s ease-in-out;
}