html {
    align-content: center;
    margin-left  : 10%;
    margin-right : 10%;
    margin-top   : 5%;
}

/* body {} */

* {
    box-sizing: border-box;
}

.column {
    float  : left;
    width  : 33.33%;
    padding: 5px;
}

/* Clearfix (clear floats) */
.row::after {
    content: "";
    clear  : both;
    display: table;
}

/* Responsive layout - makes the three columns stack on top of each other instead of next to each other */
@media screen and (max-width: 1600px) {
    .column {
        width: 50%;
    }
}
@media screen and (max-width: 1024px) {
    .column {
        width: 100%;
    }
}

figcaption {
    font-weight: bold;
    font-size  : 1.2em;
    margin     : 0.5em;
}

/* The actual timeline (the vertical ruler) */
.timeline {
    position : relative;
    max-width: 1200px;
    margin   : 0 auto;
}

/* The actual timeline (the vertical ruler) */
.timeline::after {
    content         : '';
    position        : absolute;
    width           : 6px;
    background-color: grey;
    top             : 0;
    bottom          : 0;
    left            : 50%;
    margin-left     : -3px;
}

/* Container around content */
.container {
    padding         : 10px 40px;
    position        : relative;
    background-color: inherit;
    width           : 50%;
}

/* The circles on the timeline */
.container::after {
    content         : '';
    position        : absolute;
    width           : 25px;
    height          : 25px;
    right           : -17px;
    background-color: lightskyblue;
    border          : 4px solid #FF9F55;
    top             : 15px;
    border-radius   : 50%;
    z-index         : 1;
}

/* Place the container to the left */
.left {
    left: 0;
}

/* Place the container to the right */
.right {
    left: 50%;
}

/* Add arrows to the left container (pointing right) */
.left::before {
    content     : " ";
    height      : 0;
    position    : absolute;
    top         : 22px;
    width       : 0;
    z-index     : 1;
    right       : 30px;
    border      : medium solid grey;
    border-width: 10px 0 10px 10px;
    border-color: transparent transparent transparent grey;
}

/* Add arrows to the right container (pointing left) */
.right::before {
    content     : " ";
    height      : 0;
    position    : absolute;
    top         : 22px;
    width       : 0;
    z-index     : 1;
    left        : 30px;
    border      : medium solid grey;
    border-width: 10px 10px 10px 0;
    border-color: transparent grey transparent transparent;
}

/* Fix the circle for containers on the right side */
.right::after {
    left: -16px;
}

/* The actual content */
.content {
    padding         : 5px 15px 15px 15px;
    background-color: lightgrey;
    position        : relative;
    border-radius   : 6px;
    font-size       : 1.2em;
}

.left .content h3 {
    text-align: right;
}

/* Media queries - Responsive timeline on screens less than 600px wide */
@media screen and (max-width: 600px) {

    /* Place the timelime to the left */
    .timeline::after {
        left: 31px;
    }

    /* Full-width containers */
    .container {
        width        : 100%;
        padding-left : 70px;
        padding-right: 25px;
    }

    /* Make sure that all arrows are pointing leftwards */
    .container::before {
        left        : 60px;
        border      : medium solid grey;
        border-width: 10px 10px 10px 0;
        border-color: transparent grey transparent transparent;
    }

    /* Make sure all circles are at the same spot */
    .left::after,
    .right::after {
        left: 15px;
    }

    /* Make all right containers behave like the left ones */
    .right {
        left: 0%;
    }

    .left .content h3 {
        text-align: left;
    }
}