span.index {
    float:left;
}

div#tc {
    overflow-y:auto;
}
a.index {
    display: block;
    text-align: left;
    margin: 0;
    font-family: Arial;
    overflow: hidden;
    position: relative;
    padding: 2px 0;
    height: 1.5em;
}


    a.index:hover {
        background: #eee;
    }

    

div.table-of-content div {
    margin: 9px;
}

div.table-of-content.one-level a span {
    display: inline-block;
    width: calc(100% - 2em);
    float: right;
    height: 1.5em;
}