timeline style : demo 31

CSS

                        .main-timeline{
                            overflow: hidden;
                            position: relative;
                        }
                        .main-timeline:before{
                            content: "";
                            width: 10px;
                            height: 100%;
                            border: 3px solid #959595;
                            position: absolute;
                            top: 40px;
                            left: 50%;
                            transform: translateX(-50%);
                        }
                        .main-timeline .timeline{
                            width: 50%;
                            padding: 10px 60px 10px 100px;
                            float: right;
                            position: relative;
                        }
                        .main-timeline .timeline:before{
                            content: "";
                            width: 40px;
                            height: 40px;
                            border-radius: 50%;
                            background: #c47c48;
                            border: 5px solid #fff;
                            box-shadow: 0 0 1px 5px #c47c48;
                            position: absolute;
                            top: 42px;
                            left: -20px;
                        }
                        .main-timeline .timeline-content{
                            display: block;
                            background: #e9e9e7;
                            padding: 70px 30px 20px;
                            box-shadow: 0 0 10px rgba(0,0,0,0.2) inset;
                            position: relative;
                        }
                        .main-timeline .timeline-content:hover{ text-decoration: none; }
                        .main-timeline .year{
                            display: block;
                            width: 80%;
                            height: 50px;
                            background: #c47c48;
                            padding: 0 0 0 50px;
                            font-size: 30px;
                            font-weight: 800;
                            color: #fff;
                            line-height: 50px;
                            box-shadow: 0 0 20px rgba(0,0,0,0.4) inset;
                            border-radius: 10px 10px 10px 0;
                            position: absolute;
                            top: 20px;
                            left: -20px;
                        }
                        .main-timeline .year:before{
                            content: "";
                            border-top: 40px solid #c47c48;
                            border-left: 20px solid transparent;
                            border-bottom: 20px solid transparent;
                            position: absolute;
                            bottom: -60px;
                            left: 0;
                        }
                        .main-timeline .title{
                            font-size: 18px;
                            font-weight: 600;
                            text-transform: uppercase;
                            color: #4a4a4a;
                        }
                        .main-timeline .description{
                            font-size: 14px;
                            color: #6f6f6f;
                            margin: 0 0 5px 0;
                        }
                        .main-timeline .timeline:nth-child(2n){
                            padding: 10px 100px 10px 60px;
                            text-align: right;
                        }
                        .main-timeline .timeline:nth-child(2n):before{
                            left: auto;
                            right: -20px;
                        }
                        .main-timeline .timeline:nth-child(2n) .year{
                            padding-right: 50px;
                            border-radius: 10px 10px 0 10px;
                            left: auto;
                            right: -20px;
                        }
                        .main-timeline .timeline:nth-child(2n) .year:before{
                            border-left: none;
                            border-right: 20px solid transparent;
                            left: auto;
                            right: 0;
                        }
                        .main-timeline .timeline:nth-child(2){ margin-top: 140px; }
                        .main-timeline .timeline:nth-child(odd){ margin: -140px 0 0 0; }
                        .main-timeline .timeline:nth-child(even){ margin-bottom: 60px; }
                        .main-timeline .timeline:first-child,
                        .main-timeline .timeline:last-child:nth-child(even){ margin: 0; }
                        .main-timeline .timeline:nth-child(2n):before{
                            background: #bf3fc8;
                            box-shadow: 0 0 1px 5px #bf3fc8;
                        }
                        .main-timeline .timeline:nth-child(2n) .year{ background: #bf3fc8; }
                        .main-timeline .timeline:nth-child(2n) .year:before{ border-top-color: #bf3fc8; }
                        .main-timeline .timeline:nth-child(3n):before{
                            background: #ce3c41;
                            box-shadow: 0 0 1px 5px #ce3c41;
                        }
                        .main-timeline .timeline:nth-child(3n) .year{ background: #ce3c41; }
                        .main-timeline .timeline:nth-child(3n) .year:before{ border-top-color: #ce3c41; }
                        .main-timeline .timeline:nth-child(4n):before{
                            background: #8cc43d;
                            box-shadow: 0 0 1px 5px #8cc43d;
                        }
                        .main-timeline .timeline:nth-child(4n) .year{ background: #8cc43d; }
                        .main-timeline .timeline:nth-child(4n) .year:before{ border-top-color: #8cc43d; }
                        @media only screen and (max-width: 990px){
                            .main-timeline:before{ top: 8%; }
                            .main-timeline .timeline{ padding: 10px 10px 10px 100px; }
                            .main-timeline .timeline:nth-child(2n){ padding: 10px 100px 10px 10px; }
                        }
                        @media only screen and (max-width: 767px){
                            .main-timeline:before{
                                width: 8px;
                                top: 0;
                                left: 12px;
                                transform: translateX(0);
                            }
                            .main-timeline .timeline,
                            .main-timeline .timeline:nth-child(even),
                            .main-timeline .timeline:nth-child(odd){
                                width: 100%;
                                float: none;
                                text-align: left;
                                padding: 0 0 0 60px;
                                margin: 0 0 30px 0;
                            }
                            .main-timeline .timeline:before,
                            .main-timeline .timeline:nth-child(2n):before{
                                width: 20px;
                                height: 20px;
                                border: 3px solid #fff;
                                top: 38px;
                                left: 6px;
                            }
                            .main-timeline .timeline:nth-child(2n) .year{
                                right: auto;
                                left: -20px;
                                border-radius: 10px 10px 10px 0;
                            }
                            .main-timeline .timeline:nth-child(2n) .year:before{
                                border-left: 20px solid transparent;
                                border-bottom: 20px solid transparent;
                                border-right: none;
                                right: auto;
                                left: 0;
                            }
                        }
                    
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