.main-timeline {
    position: relative;
}

    .main-timeline::after {
        content: '';
        position: absolute;
        width: 6px;
        background-color: #939597;
        top: 0;
        bottom: 0;
        left: 50%;
        margin-left: -3px;
    }

.timeline {
    position: relative;
    background-color: inherit;
    width: 50%;
}

    .timeline::after {
        content: '';
        position: absolute;
        width: 25px;
        height: 25px;
        right: -13px;
        background-color: #fff;
        border: 5px solid #533fb7;
        top: 15px;
        border-radius: 50%;
        z-index: 1;
    }

.left {
    padding: 0px 40px 20px 0px;
    left: 0;
}

.right {
    padding: 0px 0px 20px 40px;
    left: 50%;
}

.left::before {
    content: " ";
    position: absolute;
    top: 18px;
    z-index: 1;
    right: 30px;
    border: medium solid white;
    border-width: 10px 0 10px 10px;
    border-color: transparent transparent transparent white;
}

.right::before {
    content: " ";
    position: absolute;
    top: 18px;
    z-index: 1;
    left: 30px;
    border: medium solid white;
    border-width: 10px 10px 10px 0;
    border-color: transparent white transparent transparent;
}

.right::after {
    left: -12px;
}

.card {
    padding: 0px 30px;
    position: relative;
    border-radius: 6px;
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2);
}

@media screen and (max-width: 600px) {
    .main-timeline::after {
        left: 31px;
    }

    .timeline {
        width: 100%;
        padding-left: 70px;
        padding-right: 25px;
    }

        .timeline::before {
            left: 60px;
            border: medium solid white;
            border-width: 10px 10px 10px 0;
            border-color: transparent white transparent transparent;
        }

    .left::after, .right::after {
        left: 18px;
    }

    .left::before {
        right: auto;
    }

    .right {
        left: 0%;
    }
}