.tree li {
    list-style-type: none;
    margin: 0;
    padding: 10px 5px 0 5px;
    position: relative
}

.tree li::before,
.tree li::after {
    content: '';
    left: -20px;
    position: absolute;
    right: auto
}

.tree li::before {
    border-left: 2px solid #000;
    bottom: 50px;
    height: 100%;
    top: 0;
    width: 1px
}

.tree li::after {
    border-top: 2px solid #000;
    height: 20px;
    top: 25px;
    width: 25px
}

.tree li span {
    -moz-border-radius: 5px;
    -webkit-border-radius: 5px;
    border: 2px solid #000;
    border-radius: 3px;
    display: inline-block;
    padding: 3px 8px;
    text-decoration: none;
    cursor: pointer;
}

.tree > ul > li::before,
.tree > ul > li::after {
    border: 0
}

.tree li:last-child::before {
    height: 27px
}

.tree li span:hover {
    background: hotpink;
    border: 2px solid #94a0b4;
}

[aria-expanded="false"] > .expanded,
[aria-expanded="true"] > .collapsed {
    display: none;
}