body {
    color: #444;
    font-family: Helvetica, Arial, sans-serif;
    font-size: 14px;
    padding: 30px;
    margin: 0px;
}

h1 {
    font-size: 24px;
    line-height: 1.2em;
    margin: 0px 0px 10px 0px;
}

/* Branch */
.tree-branch {
    padding: 0px;
    margin: 0px;
}
.tree-node .tree-branch {
    padding-left: 10px; /* Nested tree branches should be indented */
}

/* Node */
.tree-node {
    list-style: none;
    line-height: 20px;
}

/* Arrow */
.tree-node .toggle-icon {
    cursor: pointer;
    display: inline-block;
    width: 10px;
    margin-right: 0px;
    font-size: 10px;
}
.tree-node .toggle-icon:hover {
    opacity: 0.8;
}
.tree-node .toggle-icon.leaf {
    visibility: hidden;
}

/* Node text */
.tree-node .text {
    cursor: pointer;
    text-decoration: underline;
}
.tree-node .text:hover {
    text-decoration: none;
}