timeline style : demo 85

CSS

(Fonts required: Roboto.)
                        .main-timeline{ font-family: 'Roboto', sans-serif; }
                        .main-timeline:after{
                            content: '';
                            display: block;
                            clear: both;
                        }
                        .main-timeline:before{
                            content: '';
                            height: 100%;
                            width: 2px;
                            border: 2px dashed #000;
                            transform: translateX(-50%);
                            position: absolute;
                            left: 50%;
                            top: 30px;
                        }
                        .main-timeline .timeline{
                            width: 50%;
                            padding: 100px 70px 0 25px;
                            margin: 0 50px 0 0;
                            float: left;
                            position: relative;
                        }
                        .main-timeline .timeline-content{
                            padding: 15px 15px 15px 40px;
                            border: 2px solid #00A79B;
                            border-radius: 15px 0 15px 15px;
                            display: block;
                            position: relative;
                        }
                        .main-timeline .timeline-content:hover{ text-decoration: none; }
                        .main-timeline .timeline-content:after{
                            content: '';
                            background-color: #00A79B;
                            height: 18px;
                            width: 15px;
                            position: absolute;
                            right: -15px;
                            top: -2px;
                            clip-path: polygon(100% 0, 0 0, 0 100%);
                        }
                        .main-timeline .timeline-year{
                            color: #fff;
                            background-color: #00A79B;
                            font-size: 32px;
                            font-weight: 900;
                            text-align: center;
                            line-height: 98px;
                            height: 100px;
                            width: 100px;
                            border-radius: 50%;
                            position: absolute;
                            right: -120px;
                            top:-85px;
                        }
                        .main-timeline .timeline-year:after{
                            content: '';
                            height: 130px;
                            width: 130px;
                            border: 8px solid #00A79B;
                            border-left-color: transparent;
                            border-radius: 50%;
                            transform: translateX(-50%) translateY(-50%) rotate(-20deg);
                            position: absolute;
                            left: 50%;
                            top: 50%;
                        }
                        .main-timeline .timeline-icon{
                            color: #fff;
                            background-color: #00A79B;
                            font-size: 35px;
                            text-align: center;
                            line-height: 50px;
                            height: 50px;
                            width: 50px;
                            border-radius: 50%;
                            transform: translateY(-50%);
                            position: absolute;
                            top: 50%;
                            left: -25px;
                            transition: all 0.3s;
                        }
                        .main-timeline .title{
                            color: #222;
                            font-size: 20px;
                            font-weight: 900;
                            text-transform: uppercase;
                            letter-spacing: 1px;
                            margin: 0 0 7px 0;
                        }
                        .main-timeline .description{
                            color: #222;
                            font-size: 15px;
                            letter-spacing: 1px;
                            text-align: justify;
                            margin: 0 0 5px;
                        }
                        .main-timeline .timeline:nth-child(even){
                            padding: 100px 25px 0 70px;
                            margin: 0 0 0 50px;
                            float: right;
                        }
                        .main-timeline .timeline:nth-child(even) .timeline-content{
                            padding: 15px 40px 15px 15px;
                            border-radius: 0 15px 15px 15px;
                        }
                        .main-timeline .timeline:nth-child(even) .timeline-content:after{
                            transform: rotateY(180deg);
                            right: auto;
                            left: -15px;
                        }
                        .main-timeline .timeline:nth-child(even) .timeline-year{
                            right: auto;
                            left: -120px;
                        }
                        .main-timeline .timeline:nth-child(even) .timeline-year:after{
                            transform: translateX(-50%) translateY(-50%) rotate(200deg);
                        }
                        .main-timeline .timeline:nth-child(even) .timeline-icon{
                            left: auto;
                            right: -25px;
                        }
                        .timeline:nth-child(4n+2) .timeline-content,
                        .timeline:nth-child(4n+2) .timeline-year:after{
                            border-color: #9E005D;
                        }
                        .timeline:nth-child(4n+2) .timeline-year:after{ border-left-color: transparent; }
                        .timeline:nth-child(4n+2) .timeline-content:after,
                        .timeline:nth-child(4n+2) .timeline-icon,
                        .timeline:nth-child(4n+2) .timeline-year{
                            background-color: #9E005D;
                        }
                        .timeline:nth-child(4n+3) .timeline-content,
                        .timeline:nth-child(4n+3) .timeline-year:after{
                            border-color: #f24f0e;
                        }
                        .timeline:nth-child(4n+3) .timeline-year:after{ border-left-color: transparent; }
                        .timeline:nth-child(4n+3) .timeline-content:after,
                        .timeline:nth-child(4n+3) .timeline-icon,
                        .timeline:nth-child(4n+3) .timeline-year{
                            background-color: #f24f0e;
                        }
                        .timeline:nth-child(4n+4) .timeline-content,
                        .timeline:nth-child(4n+4) .timeline-year:after{
                            border-color: #0870C5;
                        }
                        .timeline:nth-child(4n+4) .timeline-year:after{ border-left-color: transparent; }
                        .timeline:nth-child(4n+4) .timeline-content:after,
                        .timeline:nth-child(4n+4) .timeline-icon,
                        .timeline:nth-child(4n+4) .timeline-year{
                            background-color: #0870C5;
                        }
                        @media screen and (max-width:767px){
                            .main-timeline:before{ display: none; }
                            .main-timeline .timeline{
                                width: 100%;
                                padding-top: 80px;
                                padding-right: 12px;
                                margin-bottom: 20px;
                            }
                            .main-timeline .timeline:nth-child(even){
                                padding-left: 10px;
                                padding-top: 80px;
                                margin-bottom: 20px;
                            }
                            .main-timeline .timeline-content,
                            .main-timeline .main-timeline .timeline:nth-child(even) .timeline-content{
                                background-color: #fff;
                                padding-top: 25px;
                            }
                            .main-timeline .timeline-content:after{ display: none; }
                            .main-timeline .timeline-year{
                                font-size: 24px;
                                line-height: 70px;
                                height: 70px;
                                width: 70px;
                                right: 0;
                                top: -65px;
                            }
                            .main-timeline .timeline-year:after{ display: none; }
                            .main-timeline .timeline:nth-child(even) .timeline-year{ left: 3px; }
                        }
                        @media screen and (max-width:567px){
                            .main-timeline .title{ font-size: 18px; }
                        }
                    
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