<nav>
  <ul>
    <li>
      <div class="home-icon">
        <div class="roof">
          <div class="roof-edge"></div>
        </div>
        <div class="front"></div>
      </div>
    </li>
    <li>
      <div class="about-icon">
        <div class="head">
          <div class="eyes"></div>
          <div class="beard"></div>
        </div>
      </div>
    </li>
    <li>
      <div class="work-icon">
        <div class="paper"></div>
        <div class="lines"></div>
        <div class="lines"></div>
        <div class="lines"></div>
      </div>
    </li>
    <li>
      <div class="mail-icon">
        <div class="mail-base">
          <div class="mail-top"></div>
        </div>
      </div>
    </li>
  </ul>
</nav>

<section>
  <h1>3d rotating navigation</h1>
  <h2>+ CSS Icons</h2>
</section>

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

:after {
  content: "";
}

section {
  position: relative;
  left: 100px;
}

h1 { 
  margin:80px 0 10px 0;
  font-size: 52px;
  font-family: 'Montserrat', sans-serif;
  text-transform: uppercase;
  text-shadow: 1px 1px 0px #DC143C,
  2px 2px 0px #DC143C,
  3px 3px 0px #DC143C,
  4px 4px 0px #DC143C;
}

h2 {
  font-size: 24px;
}

body {
  padding: 100px 0;
  background: lightblue;
  color: white;
  max-width:640px;
  font-family: 'Montserrat', sans-serif;
  font-size: 14px;
  line-height:1.4;
  font-smoothing: anti-aliased;
}

nav {
  float: left;
  position: relative;
  top: 0;
  left: 0;
  background: transparent;
}

nav ul {
  text-align: center;
}

nav ul li {
  position: relative;
  width: 70px;
  cursor: pointer;
  background: crimson;
  text-transform: uppercase;
  transition:all .4s ease-out;
}

nav ul li:after {
  position: absolute;
  background: white;
  color: crimson;
  top:0;
  left: 70px;
  width: 70px; height: 100%;
  opacity:.5;
  transform: perspective(400px) rotateY(90deg);
  transform-origin: 0 100%;
  transition:all .4s ease-out;
}

nav ul li:nth-child(1):after { 
  content: "Home";
  line-height: 88px;
}
nav ul li:nth-child(2):after { 
  content: "About";
  line-height: 88px;
}
nav ul li:nth-child(3):after { 
  content: "Work";
  line-height: 85px;
}
nav ul li:nth-child(4):after { 
  content: "Say hi";
  line-height: 70px;
}

nav ul li:hover {
  transform: translateX(-70px);
}

nav ul li:hover:after {
  opacity: 1;
  transform: perspective(400px) rotateY(0deg) scale(1) ;
}


nav ul li > div {
  display: inline-block;
  padding: 25px 0;
  background: transparent;
}

nav ul li div { position: relative; }

.roof {
  width: 0;
  height: 0;
  top:2px;
  border-style: solid;
  border-width: 0 21px 15px 21px;
  border-color: transparent transparent #ffffff transparent;
}

.roof-edge {
  position: absolute;
  z-index: 20;
  left: -17px;
  top: 3px;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 17px 12px 17px;
  border-color: transparent transparent crimson transparent;
}
/*white triangle over red triangle*/
.roof-edge:after {
  position: absolute;
  left: -14.5px;
  top: 3px;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 14.5px 10px 14.5px;
  border-color: transparent transparent white transparent;
}

.front {
  position: relative;
  top: 3px;
  width: 28.5px;
  height: 20px;
  margin: 0 auto;
  background: white;
}
/*door*/
.front:after {
  position: absolute;
  background: crimson;
  width: 11px;
  height: 13px;
  bottom: 0;
  left:9px;
}

/*/// About me ////*/

.head {
  width: 32px;
  height: 35px;
  background: white;
  border-radius:8px;
}
/*mouth*/
.head:after {
  width: 4px;
  height: 10px;
  background: white;
  position: absolute;
  border-radius:4px 0 0 4px;
  top:21px;
  left: 14px;
  transform:rotate(270deg);
}

.eyes {
  width: 8px;
  height: 5px;
  border-radius: 50%;
  position: absolute;
  top: 10px;
  left: 5px;
  background: crimson;
}
/*right eye*/
.eyes:after {
  width: 8px;
  height: 5px;
  border-radius: 50%;
  position: absolute;
  top: 0;
  left: 14px;
  background: crimson;
}

.beard {
  width: 32px;
  height: 17px;
  background: crimson;
  border:2px solid white;
  position: absolute;
  bottom: 0;
  left: 0;
  border-radius:0 0 8px 8px;
}
/*nose*/
.beard:after {
  position: absolute;
  top:-2px;
  left: 11px;
  background: white;
  width:6px;
  height: 4px;
  border-left:1px solid crimson;
  border-right:1px solid crimson;
}

/*//work//*/

.paper {
  position: relative;
  height:32px;
  width: 29px;
  background: white;
  border:2px solid white;
}

/*window*/
.paper:after {
  position: absolute;
  top:1px;
  left: 0;
  width: 25px;
  height: 29px;
  background: white;
  border-top:4px solid crimson;
}

.lines {
  position: absolute;
  top: 36px;
  left: 5px;
  width: 11px;
  box-shadow: 0 0 0 1px crimson;
}

.lines:after {
  position: absolute;
  top: 4px;
  left: 3px;
  width: 14px;
  box-shadow: 0 0 0 1px crimson;
}

.lines:nth-child(2) {
  position: absolute;
  top: 44px;
  left: 8px;
  width: 11px;
}

.lines:nth-child(2):after {
  position: absolute;
  top: 4px;
  left: -3px;
  width: 11px;
}

.lines:nth-child(3) {
  position: absolute;
  top: 52px;
  left: 8px;
  width: 14px;
}

.lines:nth-child(3):after {
  display: none;
}

/*//mail //*/

.mail-base {
  position: relative;
  width: 32px;
  height: 18px;
  background: white;
}

.mail-top {
  position: absolute;
  z-index: 20;
  left: 0;
  top: 0;
  width: 0;
  height: 0;
  transform: rotate(180deg);
  border-style: solid;
  border-width: 0 16px 11px 16px;
  border-color: transparent transparent crimson transparent;
}

.mail-top:after {
  position: absolute;
  z-index: 20;
  left: -16px;
  top: 3px;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 16px 9px 16px;
  border-color: transparent transparent white transparent;
}