.main-timeline {
    overflow: hidden;
    position: relative
}

    .main-timeline:before {
        content: "";
        width: 5px;
        height: 70%;
        background: #333;
        position: absolute;
        top: 70px;
        left: 50%;
        transform: translateX(-50%)
    }

    .main-timeline .timeline-content:before, .main-timeline .timeline:before {
        top: 50%;
        transform: translateY(-50%);
        content: ""
    }

    .main-timeline .timeline {
        width: 50%;
        padding-left: 100px;
        float: right;
        position: relative
    }

        .main-timeline .timeline:before {
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: #fff;
            border: 5px solid #333;
            position: absolute;
            left: -10px
        }

    .main-timeline .timeline-content {
        display: block;
        padding-left: 150px;
        position: relative
    }

        .main-timeline .timeline-content:before {
            width: 90px;
            height: 10px;
            border-top: 7px dotted #333;
            position: absolute;
            left: -92px
        }

    .main-timeline .year {
        display: inline-block;
        width: 120px;
        height: 120px;
        line-height: 100px;
        border-radius: 50%;
        border: 10px solid #f54957;
        font-size: 30px;
        color: #f54957;
        text-align: center;
        box-shadow: inset 0 0 10px rgba(0,0,0,.4);
        position: absolute;
        top: 0;
        left: 0
    }

        .main-timeline .year:before {
            content: "";
            border-left: 20px solid #f54957;
            border-top: 10px solid transparent;
            border-bottom: 10px solid transparent;
            position: absolute;
            bottom: -13px;
            right: 0;
            transform: rotate(45deg)
        }

    .main-timeline .inner-content {
        padding: 20px 0
    }

    .main-timeline .title {
        font-size: 24px;
        font-weight: 600;
        color: #f54957;
        text-transform: uppercase;
        margin: 0 0 5px
    }

    .main-timeline .description {
        font-size: 14px;
        color: #6f6f6f;
        margin: 0 0 5px
    }

    .main-timeline .timeline:nth-child(2n) {
        padding: 0 100px 0 0
    }

        .main-timeline .timeline:nth-child(2n) .timeline-content:before, .main-timeline .timeline:nth-child(2n) .year, .main-timeline .timeline:nth-child(2n):before {
            left: auto;
            right: -10px
        }

        .main-timeline .timeline:nth-child(2n) .timeline-content {
            padding: 0 150px 0 0
        }

            .main-timeline .timeline:nth-child(2n) .timeline-content:before {
                right: -92px
            }

        .main-timeline .timeline:nth-child(2n) .year {
            right: 0
        }

            .main-timeline .timeline:nth-child(2n) .year:before {
                right: auto;
                left: 0;
                border-left: none;
                border-right: 20px solid #f54957;
                transform: rotate(-45deg)
            }

    .main-timeline .timeline:nth-child(2) {
        margin-top: 110px
    }

    .main-timeline .timeline:nth-child(odd) {
        margin: -110px 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) .year {
        border-color: #1ebad0;
        color: #1ebad0
    }

    .main-timeline .timeline:nth-child(2) .year:before {
        border-right-color: #1ebad0
    }

    .main-timeline .timeline:nth-child(2n) .title {
        color: #1ebad0
    }

    .main-timeline .timeline:nth-child(3n) .year {
        border-color: #7cba01;
        color: #7cba01
    }

    .main-timeline .timeline:nth-child(3) .year:before {
        border-left-color: #7cba01
    }

    .main-timeline .timeline:nth-child(3n) .title {
        color: #7cba01
    }

    .main-timeline .timeline:nth-child(4n) .year {
        border-color: #f8781f;
        color: #f8781f
    }

    .main-timeline .timeline:nth-child(4) .year:before {
        border-right-color: #f8781f
    }

    .main-timeline .timeline:nth-child(4n) .title {
        color: #f8781f
    }

@media only screen and (max-width:1200px) {
    .main-timeline .year {
        top: 50%;
        transform: translateY(-50%)
    }
}

@media only screen and (max-width:990px) {
    .main-timeline .timeline {
        padding-left: 75px
    }

        .main-timeline .timeline:nth-child(2n) {
            padding: 0 75px 0 0
        }

    .main-timeline .timeline-content {
        padding-left: 130px
    }

    .main-timeline .timeline:nth-child(2n) .timeline-content {
        padding: 0 130px 0 0
    }

    .main-timeline .timeline-content:before {
        width: 68px;
        left: -68px
    }

    .main-timeline .timeline:nth-child(2n) .timeline-content:before {
        right: -68px
    }
}

@media only screen and (max-width:767px) {
    .main-timeline {
        overflow: visible
    }

        .main-timeline:before {
            height: 100%;
            top: 0;
            left: 0;
            transform: translateX(0)
        }

        .main-timeline .timeline:before, .main-timeline .timeline:nth-child(2n):before {
            top: 60px;
            left: -9px;
            transform: translateX(0)
        }

        .main-timeline .timeline, .main-timeline .timeline:nth-child(even), .main-timeline .timeline:nth-child(odd) {
            width: 100%;
            float: none;
            text-align: center;
            padding: 0;
            margin: 0 0 10px
        }

            .main-timeline .timeline-content, .main-timeline .timeline:nth-child(2n) .timeline-content {
                padding: 0
            }

                .main-timeline .timeline-content:before, .main-timeline .timeline:nth-child(2n) .timeline-content:before {
                    display: none
                }

            .main-timeline .timeline:nth-child(2n) .year, .main-timeline .year {
                position: relative;
                transform: translateY(0)
            }

                .main-timeline .timeline:nth-child(2n) .year:before, .main-timeline .year:before {
                    border: none;
                    border-right: 20px solid #f54957;
                    border-top: 10px solid transparent;
                    border-bottom: 10px solid transparent;
                    top: 50%;
                    left: -23px;
                    bottom: auto;
                    right: auto;
                    transform: rotate(0)
                }

                .main-timeline .timeline:nth-child(2n) .year:before {
                    border-right-color: #1ebad0
                }

            .main-timeline .timeline:nth-child(3n) .year:before {
                border-right-color: #7cba01
            }

            .main-timeline .timeline:nth-child(4n) .year:before {
                border-right-color: #f8781f
            }

        .main-timeline .inner-content {
            padding: 10px
        }
}