body{
    background-color: #f1f1f1;
}
.main-timeline-section{
    position: relative;
    width: 95%;  
    margin:auto;
}
.main-timeline-section .timeline-start,
.main-timeline-section .timeline-end {

    border-radius:100px;
    margin: -5px;
    width:30px;
    height:30px;
}
.main-timeline-section .conference-center-line {
    position: absolute;
    width: 2px;
    height:100%;
    top: 0;
    left:11px;
    margin-left: -2px;

    z-index: -1;
}
.timeline-article{
    width:95%;
    position:relative;
    margin:11% 0px;
    min-height: 135px;
    z-index: 0;
}
.timeline-article .content-date{
    position: absolute;
    top:33%;
    left:4px; 
    font-size:18px;
    margin-left: -150px;
    transform: translateY(50%);
}
.timeline-article .meta-date {
    position: absolute;
    top:50%;
    left:10px;
    width:20px;
    height:20px;
    transform: translateY(-50%); 
    margin-left: -11px;
    border-radius: 100%;               
}
.timeline-article .content-box{
    position:absolute;
    box-shadow: 2px 2px 4px 0px #c1c1c1;
    border:1px solid #8A8A8A;
    border-radius: 5px;
    background-color: #fff;
    width:100%;
    top:50%;
    transform: translateY(-50%);
    padding:8px;
    left:0%;
    margin-left:50px;
}
.content-left-container .content-box{
    left:5%;
    margin-left: 0px;
}
.content-left-container .content-date{
    margin-left: 50px;
}
.content-right-container .content-box:before{
    content: " ";
    position:absolute; 
    left:-10px;
    top:45%;
    transform: translateX(-50%);
    border:10px solid transparent;
    border-right-color:#8A8A8A;
    display:block;
}
.content-left-container .content-box:before{
    content: " ";
    position:absolute; 
    top:40%;
    right:-30px;
    transform: translateX(-50%);
    border:10px solid transparent;
    border-left-color:#8A8A8A;
}

@media (max-width:1120px){ 
    .timeline-article.content-left-container .content-box{
        left: -10px;
    }
    .timeline-article .content-box p{
        height: 100px;
        overflow: hidden;
    }
    .conference-center-line, 
    .meta-date, 
    .timeline-start,
    .timeline-end,
    .content-left-container .content-box:before,
    .content-right-container .content-box:before {
        display: none;
    }
    .timeline-article .content-box {
        position: relative;
        margin-left: 0px;
    }
    .timeline-article {
        width:99%;
        min-height:auto;
        margin:2% 0;
    }
    .main-timeline-section {
        width:100%;
    }
    .fa-5x {
        font-size:3.5em;
    }
    .font-20 {
        font-size:18px;
    }
    .timeline-article .content-box {
        transform: translateY(0%);
    }
}

@media (max-width:748px){ 
    .timeline-article.content-left-container .content-box{
        left: -10px;
    }
    .timeline-article .content-box p{
        height: 100px;
        overflow: hidden;
    }
    .conference-center-line, 
    .meta-date, 
    .timeline-start,
    .timeline-end,
    .content-left-container .content-box:before,
    .content-right-container .content-box:before {
        display: none;
    }
    .timeline-article .content-box {
        position: relative;
        margin-left: 0px;
    }
    .timeline-article {
        width:99%;
        min-height:auto;
        margin:2% 0;
    }
    .main-timeline-section {
        width:100%;
    }
    .fa-5x {
        font-size:3em;
    }
    .font-20 {
        font-size:17px;
    }
    .timeline-article .content-box {
        transform: translateY(0%);
    }
}

@media (max-width:460px){ 
    .timeline-article.content-left-container .content-box{
        left: -10px;
    }
    .timeline-article .content-box p{
        height: 100px;
        overflow: hidden;
    }
    .conference-center-line, 
    .meta-date, 
    .timeline-start,
    .timeline-end, 
    .content-left-container .content-box:before,
    .content-right-container .content-box:before {
        display: none;
    }
    .timeline-article .content-box {
        position: relative;
        margin-left: 0px;
    }
    .timeline-article {
        width:99%;
        min-height:auto;
        margin:2% 0;
    }
    .main-timeline-section {
        width:100%;
    }
    .fa-5x {
        font-size:2.5em;
    }
    .font-20 {
        font-size:15px;
    }
    .timeline-article .content-box {
        transform: translateY(0%);
    }
}