timeline style : demo 30

CSS

                        .main-timeline{
                            padding: 10px 0;
                            overflow: hidden;
                            position: relative;
                        }
                        .main-timeline:before{
                            content: "";
                            width: 3px;
                            height: 100%;
                            border: 2px dashed #909090;
                            position: absolute;
                            top: 0;
                            left: 50%;
                            z-index: 1;
                            transform: translateX(-50%);
                        }
                        .main-timeline .timeline{
                            width: 50%;
                            padding-left: 5px;
                            float: right;
                            position: relative;
                        }
                        .main-timeline .timeline:before{
                            content: "\f005";
                            font-family: "Font Awesome 5 Free";
                            font-weight: 900;
                            width: 20px;
                            height: 20px;
                            line-height: 20px;
                            border-radius: 50%;
                            background: #f9c739;
                            font-size: 12px;
                            color: #fff;
                            text-align: center;
                            position: absolute;
                            top: 59%;
                            left: -10px;
                            z-index: 1;
                            transform: translateY(-50%);
                        }
                        .main-timeline .year{
                            display: block;
                            font-size: 60px;
                            font-weight: 700;
                            color: #1990F6;
                            line-height: 41px;
                            margin: 0;
                            text-align: right;
                        }
                        .main-timeline .inner-content{
                            padding: 40px 40px 40px 120px;
                            background: #1990f6;
                            overflow: hidden;
                            position: relative;
                        }
                        .main-timeline .inner-content:before,
                        .main-timeline .inner-content:after{
                            content: "";
                            width: 200px;
                            height: 250px;
                            border-radius: 80%;
                            background: #fff;
                            position: absolute;
                            top: 49%;
                            left: -110px;
                        }
                        .main-timeline .inner-content:after{
                            top: auto;
                            bottom: 49%;
                        }
                        .main-timeline .title{
                            font-size: 30px;
                            color: #fff;
                            margin-top: 0;
                        }
                        .main-timeline .description{
                            font-size: 15px;
                            color: #fff;
                            line-height: 20px;
                            text-align: justify;
                            margin: 0;
                        }
                        .main-timeline .timeline:nth-child(2n){ padding: 0 5px 0 0; }
                        .main-timeline .timeline:nth-child(2n):before{
                            left: auto;
                            right: -10px;
                        }
                        .main-timeline .timeline:nth-child(2n) .year{ text-align: left; }
                        .main-timeline .timeline:nth-child(2n) .inner-content{ padding: 40px 120px 40px 40px; }
                        .main-timeline .timeline:nth-child(2n) .inner-content:before,
                        .main-timeline .timeline:nth-child(2n) .inner-content:after{
                            left: auto;
                            right: -110px;
                        }
                        .main-timeline .timeline:nth-child(2){ margin-top: 170px; }
                        .main-timeline .timeline:nth-child(odd){ margin: -170px 0 0 0; }
                        .main-timeline .timeline:nth-child(even){ margin-bottom: 80px; }
                        .main-timeline .timeline:first-child,
                        .main-timeline .timeline:last-child:nth-child(even){ margin: 0; }
                        .main-timeline .timeline:nth-child(2n) .inner-content{ background: #fe370d; }
                        .main-timeline .timeline:nth-child(2n) .year{ color: #fe370d; }
                        .main-timeline .timeline:nth-child(3n) .inner-content{background: #ed7600;}
                        .main-timeline .timeline:nth-child(3n) .year{color: #ed7600;}
                        .main-timeline .timeline:nth-child(4n) .inner-content{ background: #34ac0d; }
                        .main-timeline .timeline:nth-child(4n) .year{ color: #34ac0d; }
                        .main-timeline .timeline:nth-child(5n) .inner-content{ background: #068a72; }
                        .main-timeline .timeline:nth-child(5n) .year{ color: #068a72; }
                        @media only screen and (max-width: 990px){
                            .main-timeline .inner-content{ padding: 15px 20px 15px 120px; }
                            .main-timeline .timeline:nth-child(2n) .inner-content{ padding: 15px 120px 15px 20px; }
                            .main-timeline .inner-content:before,
                            .main-timeline .inner-content:after{
                                border-radius: 60%;
                                left: -110px;
                            }
                            .main-timeline .timeline:nth-child(2n) .inner-content:before,
                            .main-timeline .timeline:nth-child(2n) .inner-content:after{ right: -115px; }
                        }
                        @media only screen and (max-width: 767px){
                            .main-timeline{ overflow: visible; }
                            .main-timeline:before{
                                left: 0;
                                right: auto;
                            }
                            .main-timeline .timeline,
                            .main-timeline .timeline:nth-child(even),
                            .main-timeline .timeline:nth-child(odd){
                                width: 100%;
                                float: none;
                                padding: 0 0 0 5px;
                                margin: 0 0 30px 0;
                            }
                            .main-timeline .timeline:last-child{ margin-bottom: 0; }
                            .main-timeline .timeline:nth-child(2n):before{
                                right: auto;
                                left: -10px;
                            }
                            .main-timeline .timeline:nth-child(2n) .year{ text-align: right; }
                            .main-timeline .timeline:nth-child(2n) .inner-content{ padding: 15px 20px 15px 120px; }
                            .main-timeline .timeline:nth-child(2n) .inner-content:before,
                            .main-timeline .timeline:nth-child(2n) .inner-content:after{
                                right: auto;
                                left: -110px;
                            }
                        }
                        @media only screen and (max-width: 480px){
                            .main-timeline .title{ font-size: 23px; }
                            .main-timeline .description{ font-size: 13px; }
                        }
                    
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