.index-box {
    width: 100%;
    height: auto;
    background-color: transparent;
    overflow-y: auto;
    overflow-x: hidden;
}

.index-box ul {
    padding: 0;
    list-style: none;
}

.index-box .index-subItem-box {
    display: none;
}

.index-box .index-item,
.index-box .index-link {
    width: 100%;
    display: block;
    color: #333333;
    text-decoration: none;
    box-sizing: border-box;
}

.index-box .index-link {
    padding: 4px 8px 4px 12px;
    cursor: pointer;
    -webkit-transition: background-color 0.3s, border-left-color 0.3s;
    -moz-transition: background-color 0.3s, border-left-color 0.3s;
    -o-transition: background-color 0.3s, border-left-color 0.3s;
    transition: background-color 0.3s, border-left-color 0.3s;
    border-left: 3px solid transparent;
    word-break: break-all;
}

.index-box .index-item.current > .index-link {
    background-color: rgba(0, 0, 0, 0.15);
    border-left: 3px solid #555555;
}

.index-box .index-link:hover {
    background-color: rgba(0, 0, 0, 0.1);
}

.index-box .index-subItem-box .index-item {
    padding-left: 1em;
}