<div class="material-menu-wrapper">
  <div class="material-menu">
    <div class="material-btn">
      <div class="material-hamburger">
        <div class="material-patty"></div>
        <div class="material-patty"></div>
        <div class="material-patty"></div>
      </div>
    </div>
    <div class="material-content">
      <nav>
        <ul>
          <li><a href="#">Home</a></li>
          <li><a href="#">About</a></li>
          <li><a href="#">Work</a></li>
          <li><a href="#">Contact</a></li>
        </ul>
      </nav>
    </div>
  </div>
</div>

<main>
  <p>Dynamically <span class="highlight">procrastinate</span> B2C users after installed base benefits.</p>
</main>

* {
  box-sizing: border-box;
}

body {
  font-family: 'Roboto', 'Arial', sans-serif;
  height: 100vh;
  line-height: 1.3;
  background: tomato;
  overflow: hidden;
  text-rendering: geometricPrecision;
  -webkit-font-smoothing: antialiased;
}

.material-menu-wrapper {
  position: absolute;
  bottom: 0;
  right: 0;
  height: 100vh;
  width: 40vw;
  overflow: hidden;
}

.material-menu {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  background: transparent;
}

.material-btn {
  will-change: transform;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  position: absolute;
  z-index: 2;
  bottom: 20px;
  right: 20px;
  width: 75px;
  height: 75px;
  background: transparent;
  cursor: pointer;
  
  &.active {
    
    &:before {
      transform: scale(18);
      
      @media (min-height: 800px) {
        transform: scale(25);
      }
    }
  }
  
  &:active {
    
    &:before {
      opacity: 0.75;
    }
  }
  
  &:before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    z-index: -1;
    width: 75px;
    height: 75px;
    background: white;
    border-radius: 50%;
    box-shadow: 0 5px 10px rgba(black, 0.5);
    cursor: pointer;
    transform-origin: center 70%;
    transform: scale(1);
    transition: all 0.35s ease-out;
  }
}

.material-content {
  padding: 10% 15%;
  position: absolute;
  top: 0;
  right: 0;
  
  &.active {
    z-index: 2;
  }
}

nav {
  
  ul {
    list-style-type: none;
    padding: 0;
    text-align: right;
  }
  
  li {
    will-change: transform, opacity;
    margin: 25px 0;
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.4s ease-out;
    
    &.active {
      transform: translateY(0);
      opacity: 1;
    }
  }
  
  @for $i from 1 through 4 {
    li:nth-child(#{$i}) {
      transition-delay: $i * .1s;
    }
  }
  
  a {
    text-decoration: none;
    font-size: 5vw;
    color: tomato;
    font-weight: 300;
  }
}

.material-hamburger {
	transition: all .3s ease-out;

	.material-patty {
		will-change: transform, opacity;
		width: 32px;
		height: 3px;
		margin: 0 0 6px 0;
		background: lighten(black, 20);
		opacity: 1;
		transform: translate(0) rotate(0deg);
		transition: all .2s ease-out;

		&:last-child {
			margin-bottom: 0;
		}
	}

	&.material-close {
    transform: rotate(-180deg);
		
		.material-patty:nth-child(1) {
			transform: translate(-10px, 4px) rotate(-45deg) scale(0.5, 1);
		}

		.material-patty:nth-child(3) {
			transform: translate(-10px, -4px) rotate(45deg) scale(0.5, 1);
		}
	}
}

main {
  will-change: transform, opacity;
  width: 80vw;
  height: 100vw;
  padding: 10vw;
  overflow: hidden;
  transition: all .35s ease-out;
  
  &.active {
    opacity: 0;
    transform: translate(-700px, 0px);
  }
  
  p {
    color: white;
    font-size: 4vw;
    font-weight: 300;
    
    .highlight {
      background: white;
      color: tomato;
      font-size: 4vw;
    }
  }
}

var circle = document.querySelector('.material-btn');
var link = document.querySelector('.material-content').querySelectorAll('li');
var ham = document.querySelector('.material-hamburger');
var main = document.querySelector('main');
var content = document.querySelector('.material-content');
var win = window;

function openMenu(event) {
 
  circle.classList.toggle('active');
  ham.classList.toggle('material-close');
  main.classList.toggle('active');
  for (var i = 0; i < link.length; i++) {
    link[i].classList.toggle('active');
  }
  content.classList.toggle('active');
  event.preventDefault();
  event.stopImmediatePropagation();
}

function closeMenu() {
  if (circle.classList.contains('active')) {
    circle.classList.remove('active');
    for (var i = 0; i < link.length; i++) {
      link[i].classList.toggle('active');
    }
    ham.classList.remove('material-close');
    main.classList.remove('active');
    content.classList.toggle('active');
  }
}

circle.addEventListener('click', openMenu, false);

win.addEventListener('click', closeMenu, false);