alert-notification should only be present when a user has unread notifications. This component uses same code as _navbar.scss
<header class="navbar" role="banner">
  <div class="container-center">
    <div class="navbar-content">
      <div class="navbar-brand">
        <a class="brand" href="/" role="">
          <span class="sr-only">
            AIcrowd
          </span>
        </a>
      </div>  

      <div class="navbar-search">
        <input class="textbox-search" id="" name="" type="search" placeholder="Search">
      </div>

      <div class="navbar-options">
        <ul class="navbar-navigation">
          <li class="navbar-navigation-item">
            <a class="navbar-navigation-link" href="/">Challenges</a>
          </li>

          <li class="navbar-navigation-item">
            <a class="navbar-navigation-link" href="/">Practice</a>
          </li>

          <li class="navbar-navigation-item">
            <a class="navbar-navigation-link" href="/">Blog</a>
          </li>

          <li class="navbar-navigation-item">
            <button class="btn-dropdown">
              More<i class="las la-angle-down"></i>
            </button>
            
            <div class="dropdown-menu">
              <ul class="dropdown-menu-list">
                <li class="dropdown-menu-item">
                  <a class="dropdown-menu-link" href="/">
                    Organize a Challenge
                  </a>
                </li>

                <li class="dropdown-menu-item">
                  <a class="dropdown-menu-link" href="/">
                    User Rankings
                  </a>
                </li>

                <li class="dropdown-menu-item">
                  <a class="dropdown-menu-link" href="/">
                    FAQ
                  </a>
                </li>

                <li class="dropdown-menu-item">
                  <a class="dropdown-menu-link" href="/">
                    Our Team
                  </a>
                </li>

                <li class="dropdown-menu-item">
                  <a class="dropdown-menu-link" href="/">
                    Jobs
                  </a>
                </li>

                <hr class="dropdown-menu-divider">

                <li class="dropdown-menu-item">
                  <a class="dropdown-menu-link" href="/">
                    Contact
                  </a>
                </li>
              </ul>  

              <hr class="dropdown-menu-divider">

              <div class="dropdown-menu-follow">
                <h4 class="dropdown-menu-title">Follow Us</h4>

                <div class="btn-group">
                  <a class="btn-facebook" href="/" role="button">
                    <i class="lab la-facebook-f">
                      <span class="sr-only">
                        Share on Facebook
                      </span>
                    </i>
                  </a>

                  <a class="btn-twitter" href="/" role="button">
                    <i class="lab la-twitter">
                      <span class="sr-only">
                        Share on Twitter
                      </span>
                    </i>
                  </a>

                  <a class="btn-facebook" href="/" role="button">
                    <i class="lab la-facebook-f">
                      <span class="sr-only">
                        Share on Facebook
                      </span>
                    </i>
                  </a>
                </div>
              </div>
            </div>
            <!-- /dropdown-menu -->
          </li>
        </ul>

        <a class="btn-search" href="/" role="button">
          <i class="las la-search"></i>
          <span class="sr-only">
            Search icon
          </span>
        </a>

        <button class="btn-menu">
          <i class="las la-bars">
          <span class="sr-only">
            Menu icon
          </span>
        </button>

        <div class="notifications-container">
          <button class="btn-notifications">
            <i class="las la-bell"></i>
            <span class="alert-notification"></span>
            <span class="sr-only">
              Notifications icon
            </span>
          </button>

          <div class="dropdown-notifications">
            <h3 class="dropdown-title">
              Notifications
            </h3>   

            <div class="dropdown-notifications-content">
              <div class="notification-item-user">
                <a class="notification-item-overlay" href="/"></a>
                <div class="notification-item-content">
                  <div class="notification-item-image user-rating-1">
                    <img class="avatar" src="./../../assets/images/placeholder-user-avatar-1.jpg" alt="User avatar">
                  </div> 
                  <div class="notification-item-text">
                    <span class="notification-item-description">
                      <strong>username</strong> followed you
                    </span>

                    <span class="notification-item-time">
                      2 hours ago 
                    </span>
                  </div> 
                </div>
              </div>

              <div class="notification-item-challenge">
                <a class="notification-item-overlay" href="/"></a>
                <div class="notification-item-content">
                  <div class="notification-item-image">
                    <img class="avatar" src="./../../assets/images/placeholder-challenge-1.png" alt="User avatar">
                  </div> 
                  <div class="notification-item-text">
                    <span class="notification-item-description">
                      You have moved from X to X place in the <strong>Challenge_title</strong> leaderboard
                    </span>

                    <span class="notification-item-time">
                    Yesterday
                    </span>
                  </div> 
                </div>
              </div>

              <div class="notification-item-user">
                <a class="notification-item-overlay" href="/"></a>
                <div class="notification-item-content">
                  <div class="notification-item-image user-rating-4">
                    <img class="avatar" src="./../../assets/images/placeholder-user-avatar-2.jpg" alt="User avatar">
                  </div> 
                  <div class="notification-item-text">
                    <span class="notification-item-description">
                      <strong>username</strong> followed you
                    </span>

                    <span class="notification-item-time">
                      1 week ago
                    </span>
                  </div> 
                </div>
              </div>

              <div class="notification-item-challenge">
                <a class="notification-item-overlay" href="/"></a>
                <div class="notification-item-content">
                  <div class="notification-item-image">
                    <img class="avatar" src="./../../assets/images/placeholder-challenge-2.png" alt="User avatar">
                  </div> 
                  <div class="notification-item-text">
                    <span class="notification-item-description">
                      You have moved from X to X place in the <strong>Challenge_title</strong> leaderboard
                    </span>

                    <span class="notification-item-time">
                      2 weeks ago
                    </span>
                  </div> 
                </div>
              </div>
            </div>

            <hr class="dropdown-divider">

            <div class="dropdown-link">
              <a href="/" class="dropdown-link-content">
                <span>View all</span>
                <i class="las la-arrow-right"></i>
              </a>
            </div>
          </div>
          <!-- /dropdown-notifications -->
        </div>

        <div class="user-container">
          <button class="btn-user">
            <div class="user-rating-4">
              <img class="avatar" src="./../../assets/images/placeholder-user-avatar-1.jpg" alt="User avatar">
            </div>
          </button>

          <div class="dropdown-menu-user">
            <div class="preview-user-detail">
              <a class="user-overlay" href="/"></a> 
              <div class="user-content">
                <div class="user-avatar user-rating-1">
                  <img class="avatar" src="./../../assets/images/placeholder-user-avatar-3.jpg" alt="User avatar">
                </div> 

                <div class="user-text">
                  <span class="user-name">
                    Username
                  </span>

                  <span class="user-details">
                    View profile
                  </span>
                </div> 
              </div>
            </div>

            <ul class="dropdown-menu-list">
              <li class="dropdown-menu-item">
                <a class="dropdown-menu-link" href="/">
                  Edit Profile
                </a>
              </li>

              <li class="dropdown-menu-item">
                <a class="dropdown-menu-link" href="/">
                  Account Settings
                </a>
              </li>

              <hr class="dropdown-menu-divider">

              <li class="dropdown-menu-item">
                <a class="dropdown-menu-link" href="/">
                  Log Out
                </a>
              </li>
            </ul>  
          </div>
          <!-- /dropdown-menu-user -->
        </div>
        
      </div>  
    </div>
  </div>
</header>