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HTML

              
                <header>
  <div class="container">
    <h1 class="text-center text-danger grad-over">Double Vertical Timeline</h1>
    
  </div></header><br><br>
  <section id="timeline-wrapper">
    <div class="container-fluid">
      <div class="row">
        <div class="timeline-top">
          <div class="top-year">2018</span></div>

        </div>
        <div class="timeline-block">
          <div class="timeline-events">
            <br>
            <div class="event l-event col-md-6 col-sm-6 col-xs-8 "><span class="thumb fa fa-codepen"></span>
              <div class=" event-body">
                <div class="person-image pull-left "><img src="https://cdn1.iconfinder.com/data/icons/user-pictures/100/male3-512.png" alt="person" /></div>
<div class="event-content">
<h5 class="text-primary text-left">IT-PLUS programming solution </h5>
<span class="text-muted text-left" style="display:block; margin: 0"><small>19 October 2016</small></span>
<br><br>
                <blockquote class="text-muted text-left">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quaerat ipsum voluptates sapiente beatae non praesentium vitae dolorum qui, reprehenderit harum <br>
<cite class="text-muted text-right text-bold">- Alex Martin</cite>
</blockquote>

</div>
              </div> <!-- end of event body -->
<div class="clear-fix"></div>
            </div><!-- end of left event -->
            <div class="row"></div>
            <div class="event r-event col-md-6 col-sm-6 col-xs-8 "><span class="thumb fa fa-facebook"></span>
              <div class=" event-body">
                <div class="person-image pull-left "><img src="https://cdn1.iconfinder.com/data/icons/user-pictures/100/male3-512.png" alt="person" /></div>
<div class="event-content">
<h5 class="text-primary text-left">IT-PLUS programming solution </h5>
<span class="text-muted text-left" style="display:block; margin: 0"><small>19 October 2016</small></span>
<br><br>
                <blockquote class="text-muted text-left">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quaerat ipsum voluptates sapiente beatae non praesentium vitae dolorum qui, reprehenderit harum <br>
<cite class="text-muted text-right text-bold">- Alex Martin</cite>
</blockquote>

</div>
              </div>
            </div><!-- end of right event <-->
              <div class="clearfix"></div>
            </-->
            <div class="row"></div>
            <div class="event l-event col-md-6 col-sm-6 col-xs-8 "><span class="thumb fa fa-twitter"></span>
              <div class=" event-body">
                <div class="person-image pull-left "><img src="https://cdn1.iconfinder.com/data/icons/user-pictures/100/male3-512.png" alt="person" /></div>
<div class="event-content">
<h5 class="text-primary text-left">IT-PLUS programming solution </h5>
<span class="text-muted text-left" style="display:block; margin: 0"><small>19 October 2016</small></span>
<br><br>
                <blockquote class="text-muted text-left">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quaerat ipsum voluptates sapiente beatae non praesentium vitae dolorum qui, reprehenderit harum <br>
<cite class="text-muted text-right text-bold">- Alex Martin</cite>
</blockquote>
                </div>
</div>
            </div><!-- end of left event <-->
              <div class="clearfix"></div>
            
            <div class="row"></div>
            <div class="event r-event col-md-6 col-sm-6 col-xs-8 ">
              <span class="thumb fa fa-codepen"></span>
             <div class=" event-body">
                <div class="person-image pull-left "><img src="https://cdn1.iconfinder.com/data/icons/user-pictures/100/male3-512.png" alt="person" /></div>
<div class="event-content">
<h5 class="text-primary text-left">IT-PLUS programming solution </h5>
<span class="text-muted text-left" style="display:block; margin: 0"><small>19 October 2016</small></span>
<br><br>
                <blockquote class="text-muted text-left">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quaerat ipsum voluptates sapiente beatae non praesentium vitae dolorum qui, reprehenderit harum <br>
<cite class="text-muted text-right text-bold">- Alex Martin</cite>
</blockquote>
                </div>
</div>
            </div><!-- end of right event <-->
              <div class="clearfix"></div>
            </-->
          </div><!-- end of timeline events -->
          <div class="clearfix"></div>
        </div>
      </div>
    </div>
  </section>
<br /><hr />
<footer class="text-center">
  <div class="social">
    Follow Me:
    <a target="_blank" href="https://codepen.io/hosamsam/" >
<abbr title="Codepen"><i class="fa fa-codepen follow" ></i></abbr>
    </a>
    

    <a href="https://github.com/hosam1696"><abbr title="Github" target="_blank"><i class="fa fa-github "></i></abbr></a>
  </div>
</footer>
              
            
!

CSS

              
                $screen-sm-min : 768px;
$light-blue : #03a9f4;
body {
  font-size: 14px;
  overflow-x:hidden;
  background: linear-gradient(to bottom, rgba(255,255,255,.9), rgba(255,255,255,1) 7%, rgba(204, 204, 204, .8) 7%, rgba(238, 238, 238,.92)
 8%,rgba(238, 238, 238,.9)), url(http://previews.123rf.com/images/egorzem/egorzem1502/egorzem150200017/36422240-Abstract-3d-geometric-background-White-seamless-texture-with--Stock-Photo.jpg);
  header {
    text-align: center;
    
    .grad-over {
      font-size: 3em;
      font-weight: bold;
      position: relative;
      display: inline-block;
      text-shadow: 2px 2px 2px #fff;
      overflow: hidden;
      &:after {
        content: "";
        position: absolute;
        width: 200%;
        height: 100%;
        background: linear-gradient(90deg, darkorange, mediumvioletred);
        top: 0;
        left: 0;
        mix-blend-mode: screen;
        transition: all 2s ease-in-out;
      }
      &:hover:after {
        left: -100%;
      }
    }
  }
  
  #timeline-wrapper {
    .timeline-top {
     // background-color: hotpink;
      text-align: center;
      .top-year {
        display:inline-block;
        width: 80px;
        height:80px;
        border-radius: 40px;
        background-color: $light-blue;
        color: #fff;
        line-height: 80px;
        text-align: center;
        font-size: 2.8rem;
        &>span {
          font-size: 3rem
        }
      }
    }
    .timeline-block {
      width: 100%;
      height: auto;
      position: relative;
      //background: linear-gradient(to right, #eee,#eee 50%, rgba(225,225,225,1) 50%, rgba(225,225,225,1));
      &:after {
        content: "";
        position: absolute;
        width: 4px;
        height: 100%;
        background-color: $light-blue;
        left: 50%;
        top: 0;
        margin-left: -2px;
      }
      
      .timeline-events {
        .l-event {
          float: left;
          position: relative;
          
          .thumb{
            right: 0;
            transform: translate(50%, -50%);
          }
          &:before,&:after {
            position: absolute;
            content: '';
            color: #333;
            width: 40px;
            height:40px;
            background: #fff;
            
            transform: translate(50%, -50%);
            border-radius: 20px;
            z-index:4;
            //box-shadow:inset 1px 1px 3px #999;
            top: 50%;right:0
            }
          &:after {
            width: 60px;
            height: 60px;
            z-index:3;
            border-radius: 30px;
            background: $light-blue;
          
          }
          .event-body {
            
            &:before {
            position: absolute;
            content: '';
            color: #333;
            width: 16px;
            height:16px;
            background: #fff;
            border-top: 1px solid #eee;
              border-right: 1px solid #eee;
            transform: rotate(45deg) translate(-50%, -50%);
            border-radius: 3px;
            top: 50%;right:-8px
            }
          }
        }
        .r-event {
          float:right;
          position: relative;
          
          .thumb{
            left: 0;
            transform: translate(-50%, -50%);
          }
          &:before, &:after {
            position: absolute;
            content: '';
            color: #333;
            width: 40px;
            height:40px;
            background: #fff;
            color: #333;
            transform:  translate(-50%, -50%);
            border-radius: 20px;
            top: 50%;left:0px;
            z-index:4;
     //       box-shadow:inset 1px 1px 3px  blue;
            }
          &:after {
            width: 60px;
            height: 60px;
            z-index:3;
            border-radius: 30px;
            background: $light-blue;
          
          }
          .event-body {
            float: right;
            transform:perspective(1000px) rotateY(-4deg);
            
            &:before {
              position: absolute;
            content: '';
            color: #333;
            width: 16px;
            height:16px;
            background: #fff;
            border-bottom: 1px solid #eee;
              border-left: 1px solid #eee;
            transform: rotate(45deg) translate(-50%, -50%);
            border-radius: 3px;
            top: 50%;left:-8px;
              
            }
            
            }
              
              }
        }
        .event{
          min-height: 100px;
          background: none;
          position: relative;
          box-shadow: 0px 40px 14px -35px #ccc,0px -40px 14px -35px #ccc;
          margin-top: 20px;
          .thumb {
            font-size: 30px;
            position: absolute;
            top: 50%;
            color:#333;
            z-index: 5
          }
            .event-body {
              background-color: #fff;
              min-height: 100px;
              border-radius: 5px;
              padding: 5px 10px;
              width: 90%;
              position: relative;
              border: 1px solid #eee;
              .person-image {
                display:inline-block;
                text-align:left;
              width: 20%;
              height: 100%;
              margin-right: 10px;
                padding-right: 10px;
                border-right: 1px dashed #eee;
              img{
                width: 100%;
                height: 100%;
              }              
              }
        }
      }
    }
  }
  @media (max-width: 768px) { 
     #timeline-wrapper {
    .timeline-top {
     // background-color: hotpink;
      
      text-align: right;
      padding-right: 20%
    }
    }
  .timeline-block {
    width: 100%;
      height: 100vh;
      position: relative;
      background-color: #eee;
      &:after {
        content: "";
        position: absolute;
        height: 100%;
        background-color: #333;
        left: 5%;
        top: 0;
        margin-left: -3px;
        display: none;
        
        }
    .r-event {
          .event-body {
            &:after {
              content: '';
              position: absolute;
              top: 0;
              width: 6px;
              height: 100%;
              background-color: $light-blue;
              left: -30%;
              border-radius: 3px;
              box-shadow: 1px 1px 1px #fff
            }
          }
    }
    .l-event {
          .event-body {
            &:after {
              content: '';
              position: absolute;
              top: 0;
              width: 6px;
              height: 100%;
              background-color: $light-blue;
              right: -30%;
              border-radius: 3px;
              box-shadow: -1px 1px 1px #fff
            }
          }
    }
  }
}
.footer-up {
    bottom:0
  }
footer {
  
    background: #fff;
    padding: 10px 0;
  border-top: 1px solid #eee;
    transition: bottom 1s ease-in-out;
    position: fixed;
  width: 100%;
  bottom: -100%;
  left: 0;
  z-index: 9;
  a {
    padding: 5px
  }
  }
  .social {
  color: #999;
  letter-spacing: 1px;
    i{
  background: #eee;
  color: #777;
  padding: 5px;
  border-radius: 50%;

}
i:hover {
  color: #111;
}
.follow {
  animation: light .8s ease-in-out infinite forwards
}
}

@keyframes light {
  to{color: #111}
}
}

              
            
!

JS

              
                $(function() {
  
var watchScroll =0;
var rightComments = $('.r-event .event-body');
  var leftComments = $('.l-event .event-body');
  TweenMax.staggerFrom(rightComments, 1, {x: 100, ease:Bounce.easeOut},1);
  TweenMax.staggerFrom(leftComments, 1, {x: -100,ease:Bounce.easeOut},1);

  $(window).on('scroll', function() {
    var scrollTop = $(window).scrollTop();
    (scrollTop > watchScroll)?
    $('footer').addClass('footer-up'):
      $('footer').removeClass('footer-up');
    
    watchScroll = scrollTop;
  })
})
              
            
!
999px

Console