html,
body {
  width: 100%;
  height: 100%;
 
 
}
*,
*:before,
*:after {
  box-sizing: border-box;
}
.navfx,
.navfx ul {
  position: absolute;
  width: 100%;
  height: 100%;
  padding-left: 0px;
}
.navfx {
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.3);
  opacity: 0;
  z-index: 9;
  -webkit-transform: scale(0.3);
          transform: scale(0.3);
  -webkit-transition: all 0.25s;
  transition: all 0.25s;
  left: 0;
  top: 59px;
}
.navfx ul li {
  display: table;
  width: 100%;
  height: calc(100% /4);
  border-bottom: 1px solid rgba(255,255,255,0.3);
  background: rgb(180, 209, 2);
  -webkit-perspective: 0px;
          perspective: 0px;
  -webkit-transform: rotateX(-90deg) scale(0.5);
          transform: rotateX(-90deg) scale(0.5);
  -webkit-transition: all 0.3s ease 0.1s;
  transition: all 0.3s ease 0.1s;
  padding: 15px;
}
.navfx ul li a {
  display: table-cell;
  vertical-align: middle;
  text-align: center;
  text-decoration: none;
  font-size: 1.2em;
  letter-spacing: 0.2em;
  color: #fff;
  text-shadow: 0 0 3px rgba(0,0,0,0.3);
  font-family: 'Helvetica', sans-serif;
  font-weight: 700;
}
.navfx ul li a:hover {
  background: rgba(255,255,255,0.1);
}
#toggle {
  display: none;
}
#toggle + #toggle-btn,
.nav-icon {
  position: absolute;
  top: 15px;
  right: 15px;
  border-radius: 3px;
  cursor: pointer;
}
#toggle + #toggle-btn {
  height: 40px;
  width: 30px;
  z-index: 1000;
 
}
.nav-icon,
.nav-icon:before,
.nav-icon:after {
  position: absolute;
  height: 4px;
  width: 30px;
  margin: 18px 0;
  z-index: 900;
  border-radius: 3px;
  background: #fff;
  -webkit-transition: all 0.25s;
  transition: all 0.25s;
}
.nav-icon:before {
  content: "";
  margin-top: -11px;
}
.nav-icon:after {
  content: "";
  margin-top: 11px;
}
#toggle:checked ~ .navfx {
  opacity: 1;
  -webkit-transform: scale(0.8);
          transform: scale(0.8);
}
#toggle:checked ~ .nav-icon {
  background: rgba(255,0,0,0);
}
#toggle:checked ~ .nav-icon:before {
  -webkit-transform: rotate(-225deg);
          transform: rotate(-225deg);
  margin-top: 0;
}
#toggle:checked ~ .nav-icon:after {
  -webkit-transform: rotate(225deg);
          transform: rotate(225deg);
  margin-top: 0;
}
#toggle:checked ~ .navfx ul li {
  -webkit-transform: rotateY(0deg) scale(1);
          transform: rotateY(0deg) scale(1);
}