.content {
    margin-top: 2em;
}
.content .external {
    background-image: url(../img/external-link-blue.svg);
    background-position: center right;
    background-repeat: no-repeat;
    background-size: 12px;
    padding-right: 16px;
}

.sidebar {
    margin-top: 3.5em;
}
.sidebar, .sidebar ul, .sidebar li {
    position: relative;
}
.sidebar ul {
    list-style: none;
    padding-left: 20px;
}
.sidebar li::before, .sidebar li::after {
    content: "";
    position: absolute;
    left: -12px;
}
.sidebar li::before {
    border-top: 1px solid #000;
    top: 9px;
    width: 8px;
    height: 0;
}
.sidebar li::after {
    border-left: 1px solid #000;
    height: 100%;
    width: 0;
    top: 2px;
}
.sidebar ul > li:last-child::after {
    height: 8px;
}