timeline style : demo 197

CSS

(Fonts required: Poppins.)
                    :root{
                        --color1: #2E3C47;
                        --color2: #202C36;
                    }
                    .main-timeline{ font-family: 'Poppins', sans-serif; }
                    .main-timeline:after{
                        content: '';
                        display: block;
                        clear: both;
                    }
                    .main-timeline .timeline{
                        border-right: 10px solid var(--color1);
                        width: 50%;
                        padding: 10px 20px 10px 0;
                        box-shadow: 10px 0 var(--color2);
                        float: left;
                    }
                    .main-timeline .timeline-content{
                        text-align: center;
                        display: block;
                        position: relative;
                        border-radius: 10px 10px;
                    }
                    .main-timeline .timeline-content:hover{ text-decoration: none; }
                    .main-timeline .timeline-content:before,
                    .main-timeline .timeline-content:after{
                        content:"";
                        background: var(--color2);
                        width: 80px;
                        height: 3px;
                        transform: translateY(-50%);
                        position: absolute;
                        top: 50%;
                        right: -120px;
                    }
                    .main-timeline .timeline-content:after{
                        width: 15px;
                        height: 15px;
                        border-radius: 50%;
                        right: -125px;
                    }
                    .main-timeline .timeline-year{
                        color: #fff;
                        background:var(--color2);
                        font-size: 40px;
                        font-weight: 400;
                        padding: 3px 20px 2px;
                        border-radius: 100px;
                        border: 5px solid var(--color1);
                        transform: translateY(-50%);
                        position: absolute;
                        top: 50%;
                        right: -300px;
                    }
                    .main-timeline .title{
                        color:#fff;
                        background: var(--color2);
                        font-size: 22px;
                        font-weight: 400;
                        text-transform: uppercase;
                        letter-spacing: 1px;
                        padding: 10px 10px 9px;
                        margin: 0;
                        border-radius: 10px 10px 0 0;
                    }
                    .main-timeline .description{
                        color: #555;
                        background:linear-gradient(#f1f1f1,#d9d9d9);
                        font-size: 15px;
                        letter-spacing: 1px;
                        padding: 20px 10px;
                        border-radius: 0 0 10px 10px;
                        margin: 0;
                    }
                    .main-timeline .timeline:nth-child(even){
                        float: right; 
                        border: none;
                        border-left: 10px solid var(--color2);
                        box-shadow: -10px 0 var(--color1);
                        padding: 10px 0 10px 20px;
                        margin: 0 0 0 10px;
                    }
                    .main-timeline .timeline:nth-child(even) .timeline-content:before{
                        right: auto; 
                        left: -120px;
                    }
                    .main-timeline .timeline:nth-child(even) .timeline-content:after{
                        right: auto;
                        left: -125px;
                    }
                    .main-timeline .timeline:nth-child(even) .timeline-year{
                        right: auto;
                        left: -300px;
                    }
                    .main-timeline .timeline:nth-child(2){
                        --color1: #9AE365;
                        --color2: #81CA47;
                    }
                    .main-timeline .timeline:nth-child(3){
                        --color1: #F15B53;
                        --color2: #D63C38;
                    }
                    .main-timeline .timeline:nth-child(4){
                        --color1: #7c49b7;
                        --color2: #5b2499;
                    }
                    @media screen and (max-width:767px){
                        .main-timeline .timeline,
                        .main-timeline .timeline:nth-child(even){
                            width: 100%;
                            padding: 100px 0 20px 20px;
                            margin: 0 0 0 10px;
                            box-shadow: -10px 0 var(--color2);
                            border: none;
                            border-left: 10px solid var(--color1);
                            float: none;
                        }
                        .main-timeline .timeline-content:before,
                        .main-timeline .timeline-content:after,
                        .main-timeline .timeline:nth-child(even) .timeline-content:before,
                        .main-timeline .timeline:nth-child(even) .timeline-content:after{
                            top: -50px;
                            left: -20px;
                            width: 50px;
                        }
                        .main-timeline .timeline-content:after,
                        .main-timeline .timeline:nth-child(even) .timeline-content:after{
                            width: 15px;
                            right: auto;
                            left: 15px;
                        }
                        .main-timeline .timeline-year,
                        .main-timeline .timeline:nth-child(even) .timeline-year{
                            transform: translateX(-50%);
                            top: -85px;
                            left: 50%;
                            right: auto;
                        }
                    }
                    
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