#li-container {
    background-position: 50% 100%;
    color: rgb(255, 255, 255);
    height: 80px;
    position: absolute;
    text-align: left;
    top: 0px;
    width: 40px;
    perspective-origin: 20px 40px;
    transform-origin: 20px 40px;
    background: rgba(0, 0, 0, 0) none repeat scroll 50% 100% / auto padding-box border-box;
    border: 0px none rgb(255, 255, 255);
    list-style: none outside none;
    outline: rgb(255, 255, 255) none 0px;
}
/*#DIV_1*/

#line-top {
    top: 1px;
    color: rgb(255, 255, 255);
    height: 40px;
    left: 18px;
    position: absolute;
    text-align: left;
    width: 4px;
    z-index: 10;
    perspective-origin: 2px 21px;
    transform-origin: 2px 21px;
    background: rgb(104, 155, 81) none repeat scroll 0% 0% / auto padding-box border-box;
    border: 0px none rgb(255, 255, 255);
    list-style: none outside none;
    outline: rgb(255, 255, 255) none 0px;
    padding: 2px 0px 0px;
}

#line-bot {
    bottom: -1px;
    color: rgb(255, 255, 255);
    height: 40px;
    left: 18px;
    position: absolute;
    text-align: left;
    width: 4px;
    z-index: 10;
    perspective-origin: 2px 21px;
    transform-origin: 2px 21px;
    background: rgb(104, 155, 81) none repeat scroll 0% 0% / auto padding-box border-box;
    border: 0px none rgb(255, 255, 255);
    list-style: none outside none;
    outline: rgb(255, 255, 255) none 0px;
    padding: 2px 0px 0px;
}

#circle {
    background-position: 50% 100%;
    color: rgb(255, 255, 255);
    height: 25px;
    left: 8px;
    position: absolute;
    text-align: left;
    top: 40px;
    width: 25px;
    z-index: 20;
    perspective-origin: 12.5px 12.5px;
    transform-origin: 12.5px 12.5px;
    background: rgba(0, 0, 0, 0) url("https://www.khanacademy.org/images/progress-icons/subway-sprites-article-cs.svg") repeat scroll 50% 100% / 25px 75px padding-box border-box;
    border: 0px none rgb(255, 255, 255);
    font: normal normal normal normal 13px / 18px 'Proxima Nova Semibold', sans-serif;
    list-style: none outside none;
    margin: -12px 0px 0px;
    outline: rgb(255, 255, 255) none 0px;
    overflow: hidden;
}

/* if you develop this further, please share your progress with me, stack-user: 'akorn'*/
/******************************************

Subway navigation (by sOltan stackoverflow.com)

*******************************************/

.subway-station {
    color: rgb(255, 255, 255);
    height: 100%;
    width: 100px;
    position: relative;
}

.subway-open {
    top: 60px; /* start with a margin from the top of the table cell */
    height: 100%; /* draw through the circled number */
    left: 40px; /* indent this much */
    width: 10px;
    position: absolute; /* position relative to ancestor subway-station */
    z-index: 10;
    color: rgb(68, 68, 68);
    background: rgb(205, 205, 205) none repeat scroll 0% 0% / auto padding-box border-box;
}

.subway-close {
    top: 0px; /* start from the top of the table cell */
    height: 50px; /* draw line this much from top */
    left: 40px; /* indent this much */
    width: 10px; /* width of the line */
    position: absolute; /* position relative to ancestor subway-station */
    z-index: 10;
    color: rgb(68, 68, 68);
    background: rgb(205, 205, 205) none repeat scroll 0% 0% / auto padding-box border-box;
}

.subway-line {
    bottom: 0px; /* this indicates to start drawing line from the bottom */
    height: 100%; /* draw all the way to the top of the table cell */
    left: 40px; /* indent this much */
    width: 10px;
    position: absolute; /* position relative to ancestor subway-station */
    z-index: 10;
    color: rgb(68, 68, 68);
    background: rgb(205, 205, 205) none repeat scroll 0% 0% / auto padding-box border-box;
}

.number {
    font-family: 'Lato';
    z-index: 20;
    position: absolute;
    left: 0px;
}

.circled {
    display: inline-block;
    margin: 10px;
    border-radius: 50%;
    padding: 10px 20px;
    background: #fff;
    border: 8px solid #CDCDCD;
    color: #CDCDCD;
    text-align: center;
    font: 32px Arial, sans-serif;
    z-index: 20;
    position: absolute;
}

    .circled:hover {
        background-color: #586CEF !important;
        color: white;
    }



._hjn5n5 {
    display: block !important;
    overflow: hidden !important;
    position: relative !important;
}
._nf41ds {
    background: #FFFFFF !important;
    -moz-box-sizing: border-box !important;
    box-sizing: border-box !important;
    display: block !important;
    vertical-align: top !important;
    width: 100% !important;
}
._les45vw {
    -webkit-box-align: center !important;
    -ms-flex-align: center !important;
    -webkit-box-direction: normal !important;
    -webkit-box-orient: horizontal !important;
    background-color: transparent !important;
    color: inherit !important;
    text-decoration: none !important;
    display: -webkit-box !important;
    display: -moz-box !important;
    display: -ms-flexbox !important;
    display: -webkit-flex !important;
    display: flex !important;
    -webkit-flex-direction: row !important;
    -ms-flex-direction: row !important;
    flex-direction: row !important;
    padding: 16px 20px !important;
    position: relative !important;
    white-space: normal !important;
    -webkit-align-items: center !important;
    align-items: center !important;
}
._zoavvz {
    white-space: nowrap !important;
    width: 100% !important;
    -webkit-overflow-scrolling: touch !important;
}
._a0c0yj {
    -ms-flex-negative: 0 !important;
    -webkit-flex-shrink: 0 !important;
    flex-shrink: 0 !important;
    border-right: 1px solid #D6D8DA !important;
    width: 255px !important;
}

._1euzgkx {
    overflow-y: scroll !important;
}
._168gpdnz {
    -webkit-box-direction: normal !important;
    -webkit-box-orient: vertical !important;
    -webkit-box-align: stretch !important;
    -ms-flex-align: stretch !important;
    -webkit-align-items: stretch !important;
    align-items: stretch !important;
    border-width: 0px !important;
    border-style: solid !important;
    -moz-box-sizing: border-box !important;
    box-sizing: border-box !important;
    margin: 0px !important;
    padding: 0px !important;
    z-index: 0 !important;
    min-height: 0px !important;
    min-width: 0px !important;
    display: -webkit-box !important;
    display: -moz-box !important;
    display: -ms-flexbox !important;
    display: -webkit-flex !important;
    display: flex !important;
    -webkit-flex-direction: column !important;
    -ms-flex-direction: column !important;
    flex-direction: column !important;
    overflow: hidden !important;
    will-change: transform !important;
    position: -webkit-sticky !important;
    position: sticky !important;
    width: 100% !important;
    height: 344px !important;
    top: 0px !important;
}
._1u7fvnum {
    -ms-flex-negative: 0 !important;
    -webkit-box-direction: normal !important;
    -webkit-box-orient: vertical !important;
    -webkit-box-align: stretch !important;
    -ms-flex-align: stretch !important;
    -webkit-align-items: stretch !important;
    align-items: stretch !important;
    border-width: 0px !important;
    border-style: solid !important;
    -moz-box-sizing: border-box !important;
    box-sizing: border-box !important;
    display: -webkit-box !important;
    display: -moz-box !important;
    display: -ms-flexbox !important;
    display: -webkit-flex !important;
    display: flex !important;
    -webkit-flex-direction: column !important;
    -ms-flex-direction: column !important;
    flex-direction: column !important;
    margin: 0px !important;
    padding: 0px !important;
    z-index: 0 !important;
    min-height: 0px !important;
    min-width: 0px !important;
    position: relative !important;
    -webkit-flex-shrink: 0 !important;
    flex-shrink: 0 !important;
    border-right: 1px solid #D6D8DA !important;
    width: 255px !important;
}

._1mv4i87 {
    position: absolute !important;
    top: 0px !important;
    left: 0px !important;
}
._1naqmn96 {
    font-size: 15px !important;
    font-weight: normal !important;
    line-height: 18px !important;
    padding-top: 0px !important;
    margin-bottom: 0px !important;
    margin-top: 0px !important;
    font-family: inherit !important;
}
._1jz2ixj {
    margin-left: 15px !important;
    overflow: hidden !important;
    width: 184px !important;
    vertical-align: top !important;
}
._1d4mskp {
    float: left !important;
    position: relative !important;
}
._les45vw {
    -webkit-box-align: center !important;
    -ms-flex-align: center !important;
    -webkit-box-direction: normal !important;
    -webkit-box-orient: horizontal !important;
    background-color: transparent !important;
    color: inherit !important;
    text-decoration: none !important;
    display: -webkit-box !important;
    display: -moz-box !important;
    display: -ms-flexbox !important;
    display: -webkit-flex !important;
    display: flex !important;
    -webkit-flex-direction: row !important;
    -ms-flex-direction: row !important;
    flex-direction: row !important;
    padding: 16px 20px !important;
    position: relative !important;
    white-space: normal !important;
    -webkit-align-items: center !important;
    align-items: center !important;
}
    ._les45vw:hover {
        background-color: rgba(33,36,44,0.08) !important;
        text-decoration: none !important;
        outline: none !important;
    }