body {
  margin: 0;
  padding: 0;
  font-weight: 300;
  font-family: 'Raleway', sans-serif;
  background: #fff;
  background: radial-gradient(ellipse at center, rgba(0,0,0,0) 0%, rgba(0,0,0,0.05) 80%, rgba(0,0,0,0.15) 100%);
  overflow: hidden;
  transform-style: preserve-3d;
}
input[type='radio'],
.hide {
  display: none;
}
input[type='radio']:checked + section {
  top: 0;
}
.container {
  width: 100%;
  height: 100vh;
  transition: all 500ms;
  transform-style: preserve-3d;
}
.container section {
  position: absolute;
  top: 100vh;
  width: 100%;
  height: 100vh;
  transition: top 500ms;
  transform-style: preserve-3d;
}
.container section.home {
  background: #2196f3;
}
.container section.about {
  background: #ffc107;
}
.container section.work {
  background: #4caf50;
}
.container section.contact {
  background: #f44336;
}
.container section h1 {
  margin: 0;
  font-size: 64px;
  transform: translate(0, 40vh);
  text-align: center;
  color: rgba(255,255,255,0.85);
  transition: transform 500ms;
  transform-style: preserve-3d;
}
.container section label {
  display: block;
  position: absolute;
  top: 0;
  width: 100%;
  height: 100vh;
}
.menu {
  display: block;
  position: fixed;
  top: 20px;
  left: 25px;
  z-index: 1000;
  transform: 0deg;
  transition: all 500ms;
  width: 35px;
  height: 4px;
  background: rgba(0,0,0,0.25);
}
.menu::before,
.menu::after {
  content: '';
  display: block;
  position: absolute;
  width: 35px;
  height: 4px;
  background: rgba(0,0,0,0.25);
  transition: all 500ms;
}
.menu::before {
  top: 10px;
}
.menu::after {
  top: 20px;
}
.menu:hover {
  background: #fff;
}
.menu:hover::before,
.menu:hover::after {
  background: #fff;
}
.menu div,
.menu div label:nth-child(1) {
  display: block;
  width: 35px;
  height: 35px;
  position: absolute;
  top: -6px;
}
.menu div label:nth-child(2) {
  display: none;
}
#menu:checked + .container {
  transform: scale(0.65) translateY(-18%);
  transition: all 500ms;
  transform-style: preserve-3d;
}
#menu:checked + .container section {
  cursor: pointer;
  overflow: hidden;
  opacity: 1;
  box-shadow: 0 0 40px rgba(0,0,0,0.25);
  transform-style: preserve-3d;
}
#menu:checked + .container section h1 {
  transform: scale(0.5);
  transform-style: preserve-3d;
}
#menu:checked + .container + .menu {
  top: 30px;
  left: 20px;
  transform: rotate(225deg);
  transition: all 500ms;
  transform-origin: center center;
  background: #646464;
}
#menu:checked + .container + .menu::before,
#menu:checked + .container + .menu::after {
  background: #646464;
  transition: all 500ms;
}
#menu:checked + .container + .menu::before {
  opacity: 0;
  transition: opacity 0s;
}
#menu:checked + .container + .menu::after {
  margin-top: -20px;
  transform: rotate(90deg);
}
#menu:checked + .container + .menu div label:nth-child(2) {
  display: block;
  width: 35px;
  height: 35px;
  position: absolute;
  top: -6px;
}
#menu:checked + .container + .menu div label:nth-child(1) {
  display: none;
}
.container section.home {
  z-index: 99;
}
.container section.about {
  z-index: 98;
}
.container section.work {
  z-index: 97;
}
.container section.contact {
  z-index: 96;
}
#menu:checked + .container section.home {
  top: 192px;
}
#menu:checked + .container section.home:hover {
  top: 188px;
}
#menu:checked + .container section.about {
  top: 132px;
}
#menu:checked + .container section.about:hover {
  top: 128px;
}
#menu:checked + .container section.work {
  top: 72px;
}
#menu:checked + .container section.work:hover {
  top: 68px;
}
#menu:checked + .container section.contact {
  top: 12px;
}
#menu:checked + .container section.contact:hover {
  top: 8px;
}