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HTML

              
                <nav class="menu" role='navigation'>
  <ol>
    <li class="menu-item"><a href="#0">Home</a></li>
    <li class="menu-item"><a href="#0">About</a></li>
    <li class="menu-item" aria-haspopup="true">
      <a href="#0">Widgets</a>
      <ol class="sub-menu" aria-label="submenu">
        <li class="menu-item"><a href="#0">Big Widgets</a></li>
        <li class="menu-item"><a href="#0">Bigger Widgets</a></li>
        <li class="menu-item"><a href="#0">Huge Widgets</a></li>
      </ol>
    </li>
    <li class="menu-item" aria-haspopup="true">
      <a href="#0">Kabobs</a>
      <ol class="sub-menu" aria-label="submenu">
        <li class="menu-item"><a href="#0">Shishkabobs</a></li>
        <li class="menu-item"><a href="#0">BBQ kabobs</a></li>
        <li class="menu-item"><a href="#0">Summer kabobs</a></li>
      </ol>
    </li>
    <li class="menu-item"><a href="#0">Contact</a></li>
  </ol>
</nav>
              
            
!

CSS

              
                $green: #91d36b
$orange: #fc9b1b
$lightGrey: #999
$grey: #444
$darkGrey: #333

*
  margin: 0
  padding: 0
  box-sizing: border-box

.menu
  display: flex
  justify-content: center
  align-items: center
  width: 95%
  margin: 0 auto
  font-family: 'Orbitron', sans-serif
  
ol
  display: flex
  flex-wrap: wrap
  align-items: center
  justify-content: center
  width: 100%
  margin: 0 auto
  padding: .5em 0
  list-style: none
  
.menu-item
  background: $grey
  padding: 1em .5em
  position: relative
  border-bottom: 5px solid $lightGrey
  margin: 0 .1em
  transition: border-bottom .23s ease-in-out, background .23s linear
  cursor: pointer
  min-width: 8em
  text-align: center
  &[aria-haspopup="true"]
    border-bottom-color: $orange
  &:hover, &:focus-within
    border-bottom-color: $green
    background: $darkGrey
    .sub-menu, .sub-menu:hover
      visibility: visible
      opacity: 1
      display: flex
      
          
.sub-menu
  flex-direction: column
  align-items: flex-start
  position: absolute
  left: 0
  margin-top: 1em
  visibility: hidden
  display: none
  opacity: 0
  .menu-item
    margin: .1em 0
    padding: 1em
    width: 10em
    text-align: center
    z-index: 2
 
  
a
  color: #fff
  text-decoration: none
  text-transform: uppercase
  &:focus
    outline: none
    
@media (max-width: 690px)
  .menu
    width: 95%
    font-size: 16px
  .menu-item
    margin: .1em
    &:nth-child(1)
      order: 0
    &:nth-child(2)
      order: 1
    &:nth-child(3)
      order: 3
    &:nth-child(4)
      order: 4
    &:nth-child(5)
      order: 2
 
@media (max-width: 480px)
  .menu
    font-size: 12px
              
            
!

JS

              
                
              
            
!
999px

Console