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HTML

              
                <header class="header">

  <h1 class="header__title">Mobile Nav</h1>

  <svg class="header__toggle toggle toggle--open" width="26" height="20" fill="none" xmlns="http://www.w3.org/2000/svg">
    <path class="toggle__path" d="M0 18a1 1 0 011-1h24a1 1 0 110 2H1a1 1 0 01-1-1zM0 10a1 1 0 011-1h24a1 1 0 110 2H1a1 1 0 01-1-1zM0 2a1 1 0 011-1h24a1 1 0 110 2H1a1 1 0 01-1-1z" fill="#fff"></path>
  </svg>

  <nav class="nav">
    <ul class="nav__list">
      <li class="nav__item">
        <svg class="nav__toggle toggle toggle--close" width="26" height="20" fill="none" xmlns="http://www.w3.org/2000/svg">
          <path class="toggle__path" d="M3.707 19.092a1 1 0 010-1.414L20.677.708a1 1 0 111.415 1.413l-16.97 16.97a1 1 0 01-1.415 0z" fill="#fff"></path>
          <path class="toggle__path" d="M3.707.707a1 1 0 011.414 0l16.97 16.97a1 1 0 11-1.414 1.415L3.707 2.122a1 1 0 010-1.415z" fill="#fff"></path>
        </svg>
      </li>
      <li class="nav__item">
        <a class="nav__link" href="#">Home</a>
      </li>
      <li class="nav__item">
        <a class="nav__link" href="#">About</a>
      </li>
      <li class="nav__item">
        <a class="nav__link" href="#">Services</a>
      </li>
      <li class="nav__item">
        <a class="nav__link" href="#">Testimonials</a>
      </li>
      <li class="nav__item">
        <a class="nav__link" href="#">Contact</a>
      </li>
    </ul>
  </nav>

</header>
              
            
!

CSS

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

body {
  overflow-x: hidden;
}

.toggle {
  cursor: pointer;
}

.header {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 650px;
  background-image: linear-gradient(-14deg, rgba(0, 19, 39,.45), rgba(24, 24, 24,.65)), url('https://images.unsplash.com/photo-1502033491742-0e11fb057e16?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=9bc0ec5be8f30ca2719b36ca0b270159&auto=format&fit=crop&w=2089&q=80');
  background-size: cover;
  background-position: 44.5% center;
  color: #fff;
  font-family: 'Overlock', cursive;
  text-transform: uppercase;

  &__title {
    font-size: 2.5rem;
    letter-spacing: 2.5px;
  }

  &__toggle {
    position: absolute;
    top: 1em;
    right: 1em;
  }
}

.nav {
  $nav: &; // This makes sure we can refer back to the nav once inside &--open

  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 10;
  overflow: hidden;
  pointer-events: none; // Stops clicks registering on the nav when it's not opened

  &:before,
  &:after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    width: 50%;
    background-color: #2b2b2b;
    z-index: 5;
    transition-property: transform;
    transition-duration: .5s;
    transition-timing-function: ease-in-out;
    transition-delay: .65s;
  }
  
  &:before {
    transform: translate(-100%);
  }

  &:after {
    right: 0;
    transform: translate(100%);
  }
  
  &__list {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-evenly;
    align-items: center;
    height: 100%;
    z-index: 10;

    // Reset default UL styles
    margin: 0;
    padding: 0;
    list-style: none;
  }

  &__item {
    margin: 0;
    opacity: 0;
    transition-property: opacity;
    transition-duration: .5s;
    transition-delay: 0s;
  }

  &__link {
    color: #fff;
    text-decoration: none;
  }
  
  &--open {
    pointer-events: auto; // Lets clicks be registered

    &:before,
    &:after {
      transform: translate(0); // Brings in the curtains
      transition-delay: .0s;
    }

    #{$nav}__item {
      opacity: 1;
      transition-delay: .65s;
    }
  }
}
              
            
!

JS

              
                document.addEventListener('click', event => {
    const { target } = event;

    if (target.closest('.toggle')) {
        const nav = document.querySelector('.nav');

        nav.classList.toggle('nav--open');
    }
});
              
            
!
999px

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