timeline style : demo 175

CSS

(Fonts required: Poppins.)
                    .main-timeline{ font-family: 'Poppins', sans-serif; }
                    .main-timeline:after{
                        content: '';
                        display: block;
                        clear: both;
                    }
                    .main-timeline .timeline{
                        width: calc(50% + 30px);
                        padding: 15px 0;
                        margin: 0 0 25px;
                        float: left;
                    }
                    .main-timeline .timeline-content{
                        color: #777;
                        background-color: #fff;
                        padding: 20px 80px 20px 25px;
                        border-radius: 40px 0 0 40px;
                        box-shadow: 5px 5px 10px rgba(0,0,0,0.3);
                        display: block;
                        position: relative;
                    }
                    .main-timeline .timeline-content:hover{ text-decoration: none; }
                    .main-timeline .timeline-content:before,
                    .main-timeline .timeline-content:after{
                        content: '';
                        background: linear-gradient(to right,#111,#fff,#111);
                        width: 40px;
                        position: absolute;
                        right: 10px;
                        top: -15px;
                        bottom: -15px;
                    }
                    .main-timeline .timeline-content:after{
                        background: linear-gradient(to right,#F7A51E,#fff,#FFA502);
                        width: 60px;
                        top: 0;
                        bottom: 0;
                        right: 0;
                    }
                    .main-timeline .timeline-year{
                        color: #222;
                        font-size: 30px;
                        font-weight: 600;
                        line-height: 35px;
                        transform: translateY(-50%) rotate(90deg);
                        position: absolute;
                        top: 50%;
                        right: -7px;
                        z-index: 1;
                    }
                    .main-timeline .title{
                        font-size: 22px;
                        font-weight: 600;
                        text-transform: capitalize;
                        letter-spacing: 0.5px;
                        margin: 0 0 5px;
                    }
                    .main-timeline .description{
                        font-size: 14px;
                        letter-spacing: 1px;
                        line-height: 22px;
                        margin: 0;
                    }
                    .main-timeline .timeline:nth-child(even){ float: right; }
                    .main-timeline .timeline:nth-child(even) .timeline-content{
                        padding: 20px 20px 20px 80px;
                        border-radius: 0 40px 40px 0;
                    }
                    .main-timeline .timeline:nth-child(even) .timeline-content:before{
                        right: auto;
                        left: 10px;
                    }
                    .main-timeline .timeline:nth-child(even) .timeline-content:after{
                        right: auto;
                        left: 0;
                    }
                    .main-timeline .timeline:nth-child(even) .timeline-year{
                        right: auto;
                        left: -3px;
                    }
                    .main-timeline .timeline:nth-child(4n+2) .timeline-content:after{
                        background: linear-gradient(to right,#FE6A4A,#fff,#FE6A4A);
                    }
                    .main-timeline .timeline:nth-child(4n+3) .timeline-content:after{
                        background: linear-gradient(to right,#67CFCA,#fff,#67CFCA);
                    }
                    .main-timeline .timeline:nth-child(4n+4) .timeline-content:after{
                        background: linear-gradient(to right,#118CFB,#fff,#118CFB);
                    }
                    @media screen and (max-width:767px){
                        .main-timeline .timeline,
                        .main-timeline .timeline:nth-child(even){
                            width: 100%;
                            margin: 0 0 40px;
                        }
                        .main-timeline .timeline-content,
                        .main-timeline .timeline:nth-child(even) .timeline-content{
                            padding: 20px 20px 20px 80px;
                            border-radius: 0 40px 40px 0;
                        }
                        .main-timeline .timeline-content:before,
                        .main-timeline .timeline:nth-child(even) .timeline-content:before{
                            left: 10px;
                        }
                        .main-timeline .timeline-content:after,
                        .main-timeline .timeline:nth-child(even) .timeline-content:after{
                            left: 0px;
                            right: auto;
                        }
                        .main-timeline .timeline-year,
                        .main-timeline .timeline:nth-child(even) .timeline-year{
                            left: -4px;
                            right: auto;
                        }
                    }
                    
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