timeline style : demo 202

CSS

(Fonts required: Poppins.)
                    :root{ --main-color: #01B77A; }
                    .main-timeline{ font-family: 'Poppins', sans-serif; }
                    .main-timeline:after{
                        content: '';
                        display: block;
                        clear: both;
                    }
                    .main-timeline .timeline{
                        width: 50%;
                        padding: 150px 0 0;
                        float: left;
                    }
                    .main-timeline .timeline-content{
                        text-align: center;
                        padding: 0 20px 20px;
                        border: 3px dashed var(--main-color);
                        border-top: none;
                        box-shadow: 5px 5px 5px rgba(0,0,0,0.2);
                        border-radius: 30px;
                        display: block;
                        position: relative;
                        z-index: 1;
                    }
                    .main-timeline .timeline-content:hover{ text-decoration: none; }
                    .main-timeline .timeline-content:before{
                        content: '';
                        background-color: var(--main-color);
                        height: 110px;
                        width: 110px;
                        border-radius: 80% 100% 10px;
                        box-shadow: 0 0 20px -3px rgba(0,0,0,0.4);
                        transform: translateX(-50%) rotate(45deg);
                        position: absolute;
                        left: 50%;
                        top: -150px;
                        z-index: -1;
                    }
                    .main-timeline .timeline-year{
                        color: var(--main-color);
                        background-color: #fff;
                        font-size: 18px;
                        font-weight: 700;
                        text-transform: uppercase;
                        line-height: 20px;
                        height: 68px;
                        width: 68px;
                        padding: 15px 10px;
                        border-radius: 50%;
                        box-shadow: 3px 3px 10px rgba(0,0,0,0.5),0 0 0 7px #fff;
                        transform: translateX(-50%);
                        position: absolute;
                        top: -132px;
                        left: 50%;
                    }
                    .main-timeline .timeline-year span{ display: block; }
                    .main-timeline .title{
                        color: var(--main-color);
                        font-size: 19px;
                        font-weight: 600;
                        text-transform: capitalize;
                        margin: 0 0 10px 0;
                    }
                    .main-timeline .description{
                        color: #555;
                        font-size: 13px;
                        letter-spacing: 1px;
                        margin: 0;
                    }
                    .main-timeline .timeline:nth-child(even){
                        float: right; 
                        margin: 0 0 0 10px;
                    }
                    .main-timeline .timeline:nth-child(2){ --main-color: #FF3E58; }
                    .main-timeline .timeline:nth-child(3){ --main-color: #02A7B9; }
                    .main-timeline .timeline:nth-child(4){ --main-color: #FF8E16; }
                    @media screen and (max-width:767px){
                        .main-timeline .timeline,
                        .main-timeline .timeline:nth-child(even){
                            width: 100%;
                            margin: 0 0 30px;
                        }
                    }
                    
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