timeline style : demo 168

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% + 1px);
                        margin: 0 0 20px 5px;
                        float: right;
                    }
                    .main-timeline .timeline-content{
                        color: #666;
                        min-height: 150px;
                        padding: 15px 0 15px 75px;
                        display: block; 
                        position: relative;
                    }
                    .main-timeline .timeline-content:hover{ text-decoration: none; }
                    .main-timeline .timeline-content:before{
                        content: '';
                        background: linear-gradient(to right bottom,#FBBA27 50%,#F66D50 51%);
                        height: 150px;
                        width: 120px;
                        position: absolute;
                        left: -60px;
                        top: 0;
                        clip-path: polygon(0 0, 100% 0, 100% 70%, 50% 100%, 0 70%);
                    }
                    .main-timeline .timeline-icon{
                        color: #555;
                        background-color: #fff;
                        font-size: 40px;
                        text-align: center;
                        line-height: 98px;
                        height: 100px;
                        width: 100px; 
                        border: 2px solid #333;
                        box-shadow: 4px 4px 0 rgba(0,0,0,0.15);
                        border-radius: 50%;
                        position: absolute;
                        left: -50px;
                        top: 10px;
                    }
                    .main-timeline .title{
                        color: #222;
                        font-size: 20px;
                        font-weight: 600;
                        letter-spacing: 1px;
                        text-transform: uppercase;
                        margin: 0 0 7px;
                    }
                    .main-timeline .description{
                        font-size: 13px;
                        line-height: 20px;
                        margin: 0;
                    }
                    .main-timeline .timeline:nth-child(even){
                        margin: 0 5px 20px 0;
                        float: left;
                    }
                    .main-timeline .timeline:nth-child(even) .timeline-content{ padding: 15px 75px 15px 0; }
                    .main-timeline .timeline:nth-child(even) .timeline-content:before{
                        left: auto;
                        right: -60px;
                    }
                    .main-timeline .timeline:nth-child(even) .timeline-icon{
                        left: auto;
                        right: -50px;
                    }
                    .main-timeline .timeline:nth-child(4n+2) .timeline-content:before{
                        background: linear-gradient(to right bottom,#33ddb0 50%,#625DC1 51%);
                    }
                    .main-timeline .timeline:nth-child(4n+3) .timeline-content:before{
                        background: linear-gradient(to right bottom,#a6e530 50%,#33ce7b 51%);
                    }
                    .main-timeline .timeline:nth-child(4n+4) .timeline-content:before{
                        background: linear-gradient(to right bottom,#30c9c9 50%,#dd35c1 51%);
                    }
                    @media screen and (max-width:767px){
                        .main-timeline .timeline,
                        .main-timeline .timeline:nth-child(even){
                            width: 100%;
                            margin: 0 0 25px;
                        } 
                        .main-timeline .timeline-content:before{ left: 0; }
                        .main-timeline .timeline-content{ padding-left: 135px; }
                        .main-timeline .timeline-icon{ left: 10px; }
                        .main-timeline .timeline:nth-child(even) .timeline-content:before{ right: 0; }
                        .main-timeline .timeline:nth-child(even) .timeline-content{ padding-right: 135px; }
                        .main-timeline .timeline:nth-child(even) .timeline-icon{ right: 10px; }
                    }
                    @media screen and (max-width:576px){
                        .main-timeline .timeline-content,
                        .main-timeline .timeline:nth-child(even) .timeline-content{
                            padding: 160px 0 0 0;
                            text-align: center;
                        }
                        .main-timeline .timeline-content:before,
                        .main-timeline .timeline:nth-child(even) .timeline-content:before{
                            transform: translateX(-50%);
                            left: 50%;
                            right: auto;
                        }
                        .main-timeline .timeline-icon,
                        .main-timeline .timeline:nth-child(even) .timeline-icon{
                            transform: translateX(-50%);
                            left: 50%;
                            right: auto;
                        }
                    }
                    
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