<div class="mobile-wrapper">
  <div class="mobile-container">
    <div class="content">
      <nav>
        <input type="checkbox" id="hamburger1" />
        <label for="hamburger1"></label>
        
        <ul class="nav-links">
          <li><a href="#">about us</a></li>
          <li><a href="#">products</a></li>
          <li><a href="#">media</a></li>
          <li><a href="#">contact us</a></li>
        </ul>
      </nav>
    </div>
  </div>
</div>

@import url('https://fonts.googleapis.com/css?family=Nunito:400,700');

$nav-links: about, products, media, contact us;

* {
  box-sizing: border-box;
}

html,
body {
  font-family: 'Nunito', sans-serif;
  height: 100%;
  width: 100%;
}

body {
  background: #404040;
  display: table;
}

a {
  text-decoration: none;
}

// Mobile mockup design
.mobile-wrapper {
  display: table-cell;
  text-align: center;
  vertical-align: middle;
  .mobile-container {
    background: #fff;
    border: 20px solid #666;
    border-bottom-width: 80px;
    border-radius: 20px;
    box-shadow: 0 0 10px 10px rgba(0, 0, 0, .1);
    display: inline-block;
    height: 520px;
    margin: 0 30px;
    position: relative;
    width: 320px;
    &::before {
      background: #555;
      border: 2px solid #4a4a4a;
      border-radius: 50%;
      bottom: -67px;
      content: '';
      display: block;
      height: 50px;
      left: 50%;
      position: absolute;
      width: 50px;
      transform: translateX(-50%);
      z-index: 1;
    }
  }
}

// Inner mobile canvas
.content {
  background: aliceblue;
  display: block;
  height: 100%;
  overflow: hidden;
  width: 100%;
  nav {
    background: #fff;
    border-bottom: 1px solid #ddd;
    height: 60px;
    position: relative;
  }
  .nav-links {
    display: block;
    position: absolute;
    top: 60px;
    left: 0;
    width: 100%;
    // Dark overlay on open nav
    &::before {
      background: rgba(0, 0, 0, .5);
      content: '';
      height: 100vh;
      left: 0;
      top: 0;
      position: absolute;
      opacity: 0;
      visibility: hidden;
      width: 100%;
      transition: all .3s;
    }
    li {
      border-bottom: 1px solid #ddd;
      opacity: 0;
      visibility: hidden;
      transform: translateY(-20px);
      transition: all .3s;
      a {
        background: #fff;
        color: #404040;
        display: block;
        font-size: 18px;
        font-weight: 700;
        padding: 12px 20px;
        text-align: left;
        width: 100%;
        transition: all .3s;
        &:hover {
          color: coral;
        }
      }
    }
  }
}

// Hidden checkbox to triger mobile nav
input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  visibility: hidden;
  // Nav open styling - achieved with ':checked' selector
  &:checked + label {
    border: 4px solid silver;
    border-radius: 50%;
    height: 28px;
    top: 16px;
    left: 18px;
    width: 28px;
    transform: rotate(-135deg);
    &::before {
      background: silver;
      top: 8px;
      left: 4px;
      width: 12px;
    }
    &::after {
      background: silver;
      opacity: 1;
      top: 8px;
      left: 4px;
      visibility: visible;
      width: 12px;
    }
    &:hover {
      border-color: coral;
      &::before,
      &::after {
        background: coral;
      }
    }
  }
  &:checked ~ .nav-links {
    &::before {
      opacity: 1;
      visibility: visible;
    }
    li {
      opacity: 1;
      visibility: visible;
      transform: translateY(0);
      
      @for $i from 1 through length($nav-links) {
        &:nth-child(#{$i}) {
          transition-delay: ($i - 1)/10+s;
        }
      }
    }
  }
}

// Styling of the linked label element
label {
  background: none transparent;
  border: 4px solid coral;
  border-left: 0 solid transparent;
  border-right: 0 solid transparent;
  cursor: pointer;
  display: block;
  height: 24px;
  position: absolute;
  top: 18px;
  left: 20px;
  width: 24px;
  transition: all .2s;
  &::before {
    background: coral;
    content: '';
    height: 4px;
    left: 0;
    position: absolute;
    top: 6px;
    width: 24px;
    transition: all .2s;
  }
  &::after {
    background: coral;
    content: '';
    height: 4px;
    left: 0;
    position: absolute;
    top: 6px;
    opacity: 0;
    visibility: hidden;
    width: 100%;
    transform: rotate(90deg);
    transition: all .2s;
  }
}