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HTML 

              
                <nav class="navbar">
  <div class="container">

    <div class="navbar-header">
      <button class="navbar-toggler" data-toggle="open-navbar1">
        <span></span>
        <span></span>
        <span></span>
      </button>
      <a href="#">
        <h4>Awesome<span>logo</span></h4>
      </a>
    </div>

    <div class="navbar-menu" id="open-navbar1">
      <ul class="navbar-nav">
        <li class="active"><a href="#">Home</a></li>
        <li class="navbar-dropdown">
          <a href="#" class="dropdown-toggler" data-dropdown="my-dropdown-id">
            Categories <i class="fa fa-angle-down"></i>
          </a>
          <ul class="dropdown" id="my-dropdown-id">
            <li><a href="#">Actions</a></li>
            <li><a href="#">Something else here</a></li>
            <li class="separator"></li>
            <li><a href="#">Seprated link</a></li>
            <li class="separator"></li>
            <li><a href="#">One more seprated link.</a></li>
          </ul>
        </li>
        <li class="navbar-dropdown">
          <a href="#" class="dropdown-toggler" data-dropdown="blog">
            Blog <i class="fa fa-angle-down"></i>
          </a>
          <ul class="dropdown" id="blog">
            <li><a href="#">Some category</a></li>
            <li><a href="#">Some another category</a></li>
            <li class="separator"></li>
            <li><a href="#">Seprated link</a></li>
            <li class="separator"></li>
            <li><a href="#">One more seprated link.</a></li>
          </ul>
        </li>
        <li><a href="#">About</a></li>
        <li><a href="#">Contact</a></li>
        <li><a href="#">Signin</a></li>
      </ul>
    </div>
  </div>
</nav>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500&display=swap');

$font-family: 'Roboto', sans-serif;
$font-size-base: 0.925rem;
$base-color: #66f;
$text-dark: #3c4250;
$border-color: #eceef3;

$navbar-body-color: #fff;
// $navbar-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.035);
$navbar-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
$navbar-padding-y: 1rem;
$navbar-padding-x: 1.15rem;

$navbar-link-hover: $base-color;
$navbar-link-padding-y: 0.5rem;
$navbar-link-padding-x: 1rem;

$navbar-dropdown-padding-y: 0.5rem;
$navbar-dropdown-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.1);
$navbar-dropdown-radius: 0.75rem;

$navbar-dropdown-item-padding-y: 0.25rem;
$navbar-dropdown-item-padding-x: 1rem;

$navbar-dropdown-separator-margin-y: 9px;
$navbar-dropdown-separator-color: $border-color;

* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}

body {
  font-family: $font-family;
  font-size: $font-size-base;
}

a {
  text-decoration: none;
}

.container {
  width: 1170px;
  position: relative;
  margin: {
    left: auto;
    right: auto;
  }
  padding: {
    left: 15px;
    right: 15px;
  }
}

// Start navbar

.navbar,
.navbar > .container {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  @media (max-width: 768px) {
    display: block;
  }
}

.navbar {
  box-shadow: $navbar-shadow;
  background-color: $navbar-body-color;
  padding: $navbar-padding-y $navbar-padding-x;
  border-bottom: 1px solid $border-color;

  .container {
    @media (min-width: 576px) {
      max-width: 540px;
    }
    @media (min-width: 768px) {
      max-width: 720px;
    }
    @media (min-width: 992px) {
      max-width: 960px;
    }
    @media (min-width: 1200px) {
      max-width: 1140px;
    }
  }

  /*
  |-----------------------------------
  | Start navbar logo or brand etc..
  |-----------------------------------
  */
  .navbar-header {
    display: flex;
    align-items: center;

    @media (max-width: 768px) {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-direction: row-reverse;
    }

    .navbar-toggler {
      // border-radius: 5px;
      // background-color: transparent;
      cursor: pointer;
      border: none;
      display: none;
      outline: none;

      @media (max-width: 768px) { display: block }

      span {
        height: 2px;
        width: 22px;
        background-color: lighten($text-dark, 35%);
        display: block;
      }
      span:not(:last-child) {
        margin-bottom: 0.2rem;
      }
    }

    > a {
      font-weight: 500;
      color: $text-dark;
    }
  }

  /*
  |-----------------------------------
  | Start navbar menu
  |-----------------------------------
  */
  .navbar-menu {
    display: flex;
    align-items: center;
    flex-basis: auto;
    flex-grow: 1;

    @media (max-width: 768px) {
      display: none;
      text-align: center;
    }
 
    &.active {
      display: flex !important;
    }

    // Ul
    .navbar-nav {
      margin-left: auto;
      flex-direction: row;
      display: flex;
      padding-left: 0;
      margin-bottom: 0;
      list-style: none;

      @media (max-width: 768px) {
        width: 100%;
        display: block;
        border-top: 1px solid #EEE;
        margin-top: 1rem;
      }

      > li {
        > a {
          color: $text-dark;
          text-decoration: none;
          display: inline-block;
          padding: $navbar-link-padding-y $navbar-link-padding-x;
          &:hover {
            color: $navbar-link-hover;
          }
          @media (max-width: 768px) {
            border-bottom: 1px solid $border-color;
          }
        }
        &.active {
          a {
            color: $base-color;
          }
        }
      }

      .navbar-dropdown {
        .dropdown {
          list-style: none;
          position: absolute;
          top: 150%;
          left: 0;
          background-color: #fff;
          padding-top: $navbar-dropdown-padding-y;
          padding-bottom: $navbar-dropdown-padding-y;
          min-width: 160px;
          width: auto;
          white-space: nowrap;
          box-shadow: $navbar-dropdown-shadow;
          z-index: 99999;
          border-radius: $navbar-dropdown-radius;
          display: none;
          @media (max-width: 768px) {
            position: relative;
            box-shadow: none;
          }
          li {
            a {
              color: $text-dark;
              padding: $navbar-dropdown-item-padding-y
                       $navbar-dropdown-item-padding-x;
              display: block;
            }
          }
          &.show {
            display: block !important;
          }
        }
      }

      .dropdown > .separator {
        height: 1px;
        width: 100%;
        margin: {
          top: $navbar-dropdown-separator-margin-y;
          bottom: $navbar-dropdown-separator-margin-y;
        };
        background-color: $navbar-dropdown-separator-color;
      }
    }
  }

  .navbar-dropdown {
    position: relative;
  }
}


// Custom
.navbar .navbar-header > a span {
  color: $base-color;
}
.navbar .navbar-header h4 {
  font-weight: 500;
  font-size: 1.25rem;
  @media (max-width: 768px) {
    font-size: 1.05rem;
  }
}
!

JS 

              
                // Other important pens.
// Map: https://codepen.io/themustafaomar/pen/ZEGJeZq
// Dashboard: https://codepen.io/themustafaomar/pen/jLMPKm

let dropdowns = document.querySelectorAll('.navbar .dropdown-toggler')
let dropdownIsOpen = false

// Handle dropdown menues
if (dropdowns.length) {
  // Usually I don't recommend doing this (adding many event listeners to elements have the same handler)
  // Instead use event delegation: https://javascript.info/event-delegation
  // Why: https://gomakethings.com/why-event-delegation-is-a-better-way-to-listen-for-events-in-vanilla-js
  // But since we only have two dropdowns, no problem with that. 
  dropdowns.forEach((dropdown) => {
    dropdown.addEventListener('click', (event) => {
      let target = document.querySelector(`#${event.target.dataset.dropdown}`)

      if (target) {
        if (target.classList.contains('show')) {
          target.classList.remove('show')
          dropdownIsOpen = false
        } else {
          target.classList.add('show')
          dropdownIsOpen = true
        }
      }
    })
  })
}

// Handle closing dropdowns if a user clicked the body
window.addEventListener('mouseup', (event) => {
  if (dropdownIsOpen) {
    dropdowns.forEach((dropdownButton) => {
      let dropdown = document.querySelector(`#${dropdownButton.dataset.dropdown}`)
      let targetIsDropdown = dropdown == event.target

      if (dropdownButton == event.target) {
        return
      }

      if ((!targetIsDropdown) && (!dropdown.contains(event.target))) {
        dropdown.classList.remove('show')
      }
    })
  }
})

// Open links in mobiles
function handleSmallScreens() {
  document.querySelector('.navbar-toggler')
    .addEventListener('click', () => {
      let navbarMenu = document.querySelector('.navbar-menu')

      if (!navbarMenu.classList.contains('active')) {
        navbarMenu.classList.add('active')
      } else {
        navbarMenu.classList.remove('active')
      }
    })
}

handleSmallScreens()
!
999px

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