*, *:before, *:after { box-sizing: border-box; }


label .menu {
  position: absolute;
  right: 10px;
  top: 10px;
  z-index: 100;
  width: 50px;
  height: 50px;
  background: #FFF;
  border-radius: 50% 50% 50% 50%;
  -webkit-transition: .3s ease-in-out;
  transition: .3s ease-in-out;
  box-shadow: 0 0 0 0 #FFF, 0 0 0 0 #FFF;
  cursor: pointer;
}

label .hamburger {
  position: absolute;
  top: 24px;
  left: 12px;
  width: 26px;
  height: 3px;
  background: #000;
  display: block;
  -webkit-transform-origin: center;
  transform-origin: center;
  -webkit-transition: .2s ease-in-out;
  transition: .2s ease-in-out;
}

label .hamburger:after, label .hamburger:before {
  -webkit-transition: .2s ease-in-out;
  transition: .3s ease-in-out;
  content: "";
  position: absolute;
  display: block;
  width: 100%;
  height: 100%;
  background: #000;
}

label .hamburger:before { top: -10px; }

label .hamburger:after { bottom: -10px; }

label input { display: none; }

label input:checked + .menu {
  box-shadow: 0 0 0 100vw #FFF, 0 0 0 100vh #FFF;
  border-radius: 0;
}

label input:checked + .menu .hamburger {
  -webkit-transform: rotate(45deg);
  transform: rotate(45deg);
}

label input:checked + .menu .hamburger:after {
  -webkit-transform: rotate(90deg);
  transform: rotate(90deg);
  bottom: 0;
}

label input:checked + .menu .hamburger:before {
  -webkit-transform: rotate(90deg);
  transform: rotate(90deg);
  top: 0;
}

label input:checked + .menu + ul { opacity: 1; }

label ul {
  z-index: 200;
  position: absolute;
  top: 165px;
  left: 35%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  opacity: 0;
  -webkit-transition: .25s 0s ease-in-out;
  transition: .25s 0s ease-in-out;
  list-style: none; /* Remove default bullets */
}

label a {
  margin-bottom: 1em;
  display: block;
  color: #000;
  text-decoration: none;
}