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HTML 

              
                <link href="//netdna.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css" rel="stylesheet">

<nav class="navigation">
  <ul class="inner-navigation">
    <li class="left">
      <a href="#" class="menu-link menu-anchor">
        <i class="fa fa-bars"></i>
      </a>
    </li>
    <li class="right">
      <!--span class="notification-label"></span-->
      <div class="dropdown-container">
        <a href="#" data-dropdown="notificationMenu" class="menu-link has-notifications circle">
          <i class="fa fa-bell"></i>
        </a>
        <ul class="dropdown" name="notificationMenu">
          <li class="notification-group">
            <div class="notification-tab">
              <i class="fa fa-flag"></i>
              <h4>Tasks</h4>
              <span class="label">4</span>
            </div>
            <!-- tab -->
            <ul class="notification-list">
              <li class="notification-list-item">
                <p class="message">Lorem ipsum dolor sit amet, consectetur adipisicing elit...</p>
                <div class="item-footer">
                  <span class="from"><a href="#">project3</a></span>
                  <span class="date">2 minutes ago</span>
                </div>
              </li>
             <li class="notification-list-item">
                <p class="message">Lorem ipsum dolor sit amet, consectetur adipisicing elit...</p>
                <div class="item-footer">
                  <span class="from"><a href="#">project2</a></span>
                  <span class="date">12 hours ago</span>
                </div>
              </li>
              <li class="notification-list-item">
                <p class="message">Lorem ipsum dolor sit amet, consectetur adipisicing elit...</p>
                <div class="item-footer">
                  <span class="from"><a href="#">project6</a></span>
                  <span class="date">2 days ago</span>
                </div>
              </li>
              <li class="notification-list-item">
                <p class="message">Lorem ipsum dolor sit amet, consectetur adipisicing elit...</p>
                <div class="item-footer">
                  <span class="from"><a href="#">project2</a></span>
                  <span class="date">2 days ago</span>
                </div>
              </li>
              
            </ul>
          </li>
          <li class="notification-group">
            <div class="notification-tab">
              <i class="fa fa-bug"></i>
                <h4>Bugs</h4>
                <span class="label">2/8</span>
            </div> <!-- tab -->
            <ul class="notification-list">
              <li class="notification-list-item">
                <p class="message">Lorem ipsum dolor sit amet, consectetur adipisicing elit...</p>
                <div class="item-footer">
                  <span class="from"><a href="#">@project1</a></span>
                  <span class="date">2 minutes ago</span>
                </div>
              </li>
             <li class="notification-list-item">
                <p class="message">Lorem ipsum dolor sit amet, consectetur adipisicing elit...</p>
                <div class="item-footer">
                  <span class="from"><a href="#">@project2</a></span>
                  <span class="date">12 hours ago</span>
                </div>
              </li>
              <li class="notification-list-item">
                <p class="message">Lorem ipsum dolor sit amet, consectetur adipisicing elit...</p>
                <div class="item-footer">
                  <span class="from"><a href="#">@project3</a></span>
                  <span class="date">2 days ago</span>
                </div>
              </li>
              <li class="notification-list-item">
                <p class="message">Lorem ipsum dolor sit amet, consectetur adipisicing elit...</p>
                <div class="item-footer">
                  <span class="from"><a href="#">@project4</a></span>
                  <span class="date">2 days ago</span>
                </div>
              </li>
              <li class="notification-list-item">
                <p class="message">Lorem ipsum dolor sit amet, consectetur adipisicing elit...</p>
                <div class="item-footer">
                  <span class="from"><a href="#">@project5</a></span>
                  <span class="date">2 days ago</span>
                </div>
              </li>
              <li class="notification-list-item">
                <p class="message">Lorem ipsum dolor sit amet, consectetur adipisicing elit...</p>
                <div class="item-footer">
                  <span class="from"><a href="#">@project6</a></span>
                  <span class="date">2 days ago</span>
                </div>
              </li>
              <li class="notification-list-item">
                <p class="message">Lorem ipsum dolor sit amet, consectetur adipisicing elit...</p>
                <div class="item-footer">
                  <span class="from"><a href="#">@project7</a></span>
                  <span class="date">2 days ago</span>
                </div>
              </li>
              <li class="notification-list-item">
                <p class="message">Lorem ipsum dolor sit amet, consectetur adipisicing elit...</p>
                <div class="item-footer">
                  <span class="from"><a href="#">@project8</a></span>
                  <span class="date">2 days ago</span>
                </div>
              </li>
              
            </ul>
            <!-- list -->
          </li>
          <li class="notification-group">
            <div class="notification-tab">
              <i class="fa fa-envelope"></i>
              <h4>Messages</h4>
              <span class="label">3</span>
            </div>
            <ul class="notification-list">
              <li class="notification-list-item">
                <p class="message">Lorem ipsum dolor sit amet, consectetur adipisicing elit...</p>
                <div class="item-footer">
                  <span class="from"><a href="#">@mstrlaw</a></span>
                  <span class="date">2 minutes ago</span>
                </div>
              </li>
             <li class="notification-list-item">
                <p class="message">Lorem ipsum dolor sit amet, consectetur adipisicing elit...</p>
                <div class="item-footer">
                  <span class="from"><a href="#">@mstrlaw</a></span>
                  <span class="date">12 hours ago</span>
                </div>
              </li>
              <li class="notification-list-item">
                <p class="message">Lorem ipsum dolor sit amet, consectetur adipisicing elit...</p>
                <div class="item-footer">
                  <span class="from"><a href="#">@mstrlaw</a></span>
                  <span class="date">2 days ago</span>
                </div>
              </li>
              
            </ul>
          </li>
          <li class="notification-group">
            <div class="notification-tab">
              <i class="fa fa-calendar"></i>
              <h4>Calendar</h4>
              <span class="label">2</span>
            </div>
            <ul class="notification-list">
              <li class="notification-list-item">
                <p class="message">Lorem ipsum dolor sit amet, consectetur adipisicing elit...</p>
                <div class="item-footer">
                  <span class="from"><a href="#">@mstrlaw</a></span>
                  <span class="date">tomorrow</span>
                </div>
              </li>
             <li class="notification-list-item">
                <p class="message">Lorem ipsum dolor sit amet, consectetur adipisicing elit...</p>
                <div class="item-footer">
                  <span class="from"><a href="#">@mstrlaw</a></span>
                  <span class="date">in 2 days</span>
                </div>
              </li>
            </ul>
          </li>
          <li class="notification-group">
            <div class="notification-tab">
              <i class="fa fa-trophy"></i>
              <h4>Badges</h4>
              <span class="label">2</span>
            </div>
            <ul class="notification-list">
              <li class="notification-list-item">
                <p class="message">Lorem ipsum dolor sit amet, consectetur adipisicing elit...</p>
                <div class="item-footer">
                  <span class="from"><a href="#">technical</a></span>
                  <span class="date">2 weeks ago</span>
                </div>
              </li>
             <li class="notification-list-item">
                <p class="message">Lorem ipsum dolor sit amet, consectetur adipisicing elit...</p>
                <div class="item-footer">
                  <span class="from"><a href="#">personal</a></span>
                  <span class="date">3 weeks ago</span>
                </div>
              </li>
            </ul>
          </li>
        </ul>
      </div>
    </li>
    <li class="right">
      <a href="#" class="menu-link square">Link #2</a>
    </li>
    <li class="right">
      <a href="#" class="menu-link square">Link #1</a>
    </li>
  </ul>
</nav>

<div class="content">
  <h2>Click on the notification icon on the top right corner.</h2>
  <p>A simple notification menu with several categories. Each category act as an accordion when clicking. Menu is also responsive, hiding the list titles on smaller device.</p>
  <p>Todo:</p>
  <ul>
    <li>Embelish internal items</li>
    <li>move to React.js</li>
  </ul>
  <hr />
  <h4>A random ul to test scroll</h4>
  <ul>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
  </ul>
</div>
!

CSS 

              
                @import 'https://fonts.googleapis.com/css?family=Open+Sans';

$primary-color: #3f51b5;
$secondary-color: #ff5252;
$grey: #e3e3e3;

body{
  margin: 0;
  padding: 0;
  font-family: 'Open Sans', sans-serif;
}

.content{
  padding: 15px;
  margin-top: 60px;
  color: #333;
}

.navigation{
  position: fixed;
  top: 0;
  width: 100%;
  height: 60px;
  background: $primary-color;
  .inner-navigation{
    padding: 0;
    margin: 0;
    li{
      list-style-type: none;
      
      .menu-link{
        color: $secondary-color;
        line-height: 3.7em;
        //margin: 6px 4px;
        padding: 20px 18px;
        text-decoration: none;
        transition: background .5s, color .5s;
        &.menu-anchor{
          padding: 20px;
          margin: 0;
          background: $secondary-color;
          color: #FFF;
        }
        
        &.has-notifications{
          background: $secondary-color;
          color: #FFF;
        }
        
        &.circle{
          line-height: 3.8em;
          padding: 14px 18px;
          border-radius: 50%;
          &:hover{
            background: $secondary-color;
            color: #FFF;
          }
        }
        &.square{
          &:hover{
            background: $secondary-color;
            color: #FFF;
            transition: background .5s, color .5s;
          }
        }
      }
      
    }
  }
}

.dropdown-container{
  overflow-y: hidden;
  &.expanded{
    .dropdown{
      -webkit-animation: fadein .5s;
      -moz-animation: fadein .5s;
      -ms-animation: fadein .5s;
      -o-animation: fadein .5s;
      animation: fadein .5s;
      display: block;
    }
  }
  
  .dropdown{
    -webkit-animation: fadeout .5s;
    -moz-animation: fadeout .5s;
    -ms-animation: fadeout .5s;
    -o-animation: fadeout .5s;
    animation: fadeout .5s;
    display: none;
    position: absolute;
    width: 300px;
    height: auto;
    max-height: 600px;
    overflow-y: hidden;
    padding: 0;
    margin: 0;
    background: #eee;
    margin-top: 3px;
    margin-right: -15px;
    border-top: 4px solid $secondary-color;
    border-bottom-left-radius: 15px;
    border-bottom-right-radius: 15px;
    -webkit-box-shadow: 2px 2px 15px -5px rgba(0,0,0,0.75);
    -moz-box-shadow: 2px 2px 15px -5px rgba(0,0,0,0.75);
    box-shadow: 2px 2px 15px -5px rgba(0,0,0,0.75);
    //Doesn't work because of hidden overflow-y
    /*
    &:before{
      position: absolute;
      content: ' ';
      width: 0; 
      height: 0; 
      top: -13px;
      right: 7px;
      border-left: 8px solid transparent;
      border-right: 8px solid transparent;
      border-bottom: 10px solid $secondary-color; 
    }
    */
    
    .notification-group{
      border-bottom: 1px solid $grey;
      overflow: hidden;
      min-height: 65px;
      &:last-child{
        border-bottom: 0;
        border-bottom-left-radius: 15px;
        border-bottom-right-radius: 15px;
      }
      
      .notification-tab{
        padding: 0px 25px;
        min-height: 65px;
        &:hover{
          cursor: pointer;
          background: $primary-color;
          .fa, h4, .label{
            color: #FFF;
            display: inline-block;
          }
          .label{
            background: $secondary-color;
            border-color: $secondary-color;
          }
        }
      }
      
      .notification-list{
        padding: 0;
        overflow-y: auto;
        height: 0px;
        max-height: 250px;
        transition: height .5s;
        .notification-list-item{
          padding: 5px 25px;
          border-bottom: 1px solid $grey;
          
          .message{
            margin: 5px 5px 10px;
          }
          .item-footer{
            a{
              color: $primary-color;
              text-decoration: none;
            }
            .date{
              float:right;
            }
          }
          &:nth-of-type(odd){
            background: $grey;
          }
          &:hover{
            cursor: pointer;
          }
          &:last-child{
            border-bottom: 0;
            border-bottom-left-radius: 15px;
            border-bottom-right-radius: 15px;
          }
        }
        
      }
      
      &.expanded{
        .notification-tab{
          background: $primary-color;
          .fa, h4, .label{
            color: #FFF;
            display: inline-block;
          }
          .label{
            background: $secondary-color;
            border-color: $secondary-color;
          }
        }
        .notification-list{
          height: 250px;
          max-height: 250px;
          transition: height .5s;
        }
      }
      
      .fa, h4, .label{
        color: #333;
        display: inline-block;
      }
      .fa{
        margin-right: 5px;
        margin-top: 25px;
      }
      .label{
        float: right;
        margin-top: 20px;
        color: $primary-color;
        border: 1px solid $primary-color;
        padding: 0px 7px;
        border-radius: 15px;
      }
    }
  }
}

//Utility classes
.right{
  float: right;
}

.left{
  float: left;
}

//Media Queries
@media only screen and (max-width : 321px) {
  .dropdown-container{
    .dropdown{
      .notification-group{
        .notification-tab{
          h4{
            display: none;
          }
          &:hover{
            h4{
              display: none;
            }
          }
        }
        &.expanded{
          .notification-tab{
            h4{
              display: none;
            }
          }
        }
      }
    }
  }
}


@media only screen and (max-width : 514px) {
  .dropdown-container{
    .dropdown{
      width: 100%;
      margin: 0px;
      left: 0;
    }
  }
}

//Fade In Animation
@keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
}
@-moz-keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
}
@-webkit-keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
}
@-ms-keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
}
@-o-keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
}

//Fade Out Animation
@keyframes fadeout {
    from { opacity: 1; }
    to   { opacity: 0; }
}
@-moz-keyframes fadeout {
    from { opacity: 1; }
    to   { opacity: 0; }
}
@-webkit-keyframes fadeout {
    from { opacity: 1; }
    to   { opacity: 0; }
}
@-ms-keyframes fadeout {
    from { opacity: 1; }
    to   { opacity: 0; }
}
@-o-keyframes fadeout {
    from { opacity: 1; }
    to   { opacity: 0; }
}
!

JS 

              
                //Open dropdown when clicking on element
$(document).on('click', "a[data-dropdown='notificationMenu']",  function(e){
  e.preventDefault();
  
  var el = $(e.currentTarget);
  
  $('body').prepend('<div id="dropdownOverlay" style="background: transparent; height:100%;width:100%;position:fixed;"></div>')
  
  var container = $(e.currentTarget).parent();
  var dropdown = container.find('.dropdown');
  var containerWidth = container.width();
  var containerHeight = container.height();
  
  var anchorOffset = $(e.currentTarget).offset();

  dropdown.css({
    'right': containerWidth / 2 + 'px'
  })
  
  container.toggleClass('expanded')
  
});

//Close dropdowns on document click

$(document).on('click', '#dropdownOverlay', function(e){
  var el = $(e.currentTarget)[0].activeElement;
  
  if(typeof $(el).attr('data-dropdown') === 'undefined'){
    $('#dropdownOverlay').remove();
    $('.dropdown-container.expanded').removeClass('expanded');
  }
})

//Dropdown collapsile tabs
$('.notification-tab').click(function(e){
  if($(e.currentTarget).parent().hasClass('expanded')){
    $('.notification-group').removeClass('expanded');
  }
  else{
    $('.notification-group').removeClass('expanded');
    $(e.currentTarget).parent().toggleClass('expanded');
  }
})
!
999px

Console