timeline style : demo 180

CSS

(Fonts required: Poppins.)
                    :root{ --main-color: #662C91; }
                    .main-timeline{ font-family: 'Poppins', sans-serif; }
                    .main-timeline:after{
                        content: '';
                        display: block;
                        clear: both;
                    }
                    .main-timeline .timeline{
                        width: 50.1%;
                        margin: 0 5px 35px 0;
                        float: left;
                    }
                    .main-timeline .timeline-content{
                        color: var(--main-color);
                        padding: 25px 70px;
                        box-shadow: -3px 3px 0 1px #bebebe,0 -10px 0 var(--main-color);
                        display: block;
                        position: relative;
                    }
                    .main-timeline .timeline-content:hover{ text-decoration: none; }
                    .main-timeline .timeline-year{
                        font-size: 40px;
                        line-height: 35px;
                        font-weight: 500;
                        position: absolute;
                        top: 50%;
                        left: -10px;
                        transform: translateY(-50%) rotate(90deg);
                    }
                    .main-timeline .timeline-icon{
                        color: #fff;
                        background: var(--main-color);
                        font-size: 35px;
                        text-align: center;
                        line-height: 70px;
                        width: 100px;
                        height: 70px;
                        border-radius: 0 50px 50px 0;
                        transform: translateY(-50%);
                        position: absolute;
                        top: 50%;
                        right: -50px;
                    }
                    .main-timeline .title{
                        font-size: 25px;
                        font-weight: 600;
                        text-transform: uppercase;
                        margin: 0 0 8px;
                    }
                    .main-timeline .description{
                        color: #777;
                        font-size: 14px;
                        letter-spacing: 2px;
                        line-height: 20px;
                        margin: 0;
                    }
                    .main-timeline .timeline:nth-child(even){
                        margin: 0 0 35px 5px;
                        float: right;
                    }
                    .main-timeline .timeline:nth-child(even) .timeline-content{
                        box-shadow: 3px 3px 0 1px #bebebe,0 -10px 0 var(--main-color);
                    }
                    .main-timeline .timeline:nth-child(even) .timeline-icon{
                        border-radius: 50px 0 0 50px;
                        left: -50px;
                        right: auto;
                    }
                    .main-timeline .timeline:nth-child(even) .timeline-year{
                        left: auto;
                        right: -10px;
                    }
                    .main-timeline .timeline:nth-child(4n+2){ --main-color: #EF5C22; }
                    .main-timeline .timeline:nth-child(4n+3){ --main-color: #016837; }
                    .main-timeline .timeline:nth-child(4n+4){ --main-color: #C32630; }
                    @media screen and (max-width:767px){
                        .main-timeline .timeline,
                        .main-timeline .timeline:nth-child(even){
                            width: calc(100% - 55px);
                        }
                    }
                    @media screen and (max-width:479px){
                        .main-timeline .timeline,
                        .main-timeline .timeline:nth-child(even){
                            width: 100%;
                            padding: 60px 0 0;
                        }
                        .main-timeline .timeline-content,
                        .main-timeline .timeline:nth-child(even) .timeline-content{
                            text-align: center;
                            padding: 40px 25px 65px;
                        }
                        .main-timeline .timeline-year,
                        .main-timeline .timeline:nth-child(even) .timeline-year{
                            font-size: 33px;
                            transform: translateX(-50%) translateY(0) rotate(0deg);
                            position: absolute;
                            top: auto;
                            bottom: 15px;
                            left: 50%;
                        }
                        .main-timeline .timeline-icon, 
                        .main-timeline .timeline:nth-child(even) .timeline-icon{
                            line-height: 85px;
                            height: 80px;
                            width: 80px;
                            border-radius: 50px 50px 0 0;
                            transform: translateY(0) translateX(50%);
                            top: -60PX;
                            right: 50%;
                            left: auto;
                        }
                    }
                    
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