.yk-list-tree-box {
    display: none;
    position: fixed;
    z-index: 9999;
    top: 50%;
    transform: translateY(-50%);
    background-color: #64B5F6;
    color: #fff;
    opacity:1;
}

h3.yk-list-tree-titles {
    float: right;
    cursor: default;
    padding: 20px 8px 20px 6px;
}

h3.yk-list-tree-titles a.yk-list-tree-btn {
    color: #fff;
    display: block;
    width: 22px;
    text-align: center;
    font-size: 16px;
}

#yk-list-tree-ol {
    overflow: scroll;
    overflow-x: hidden;
    float: left;
    /*height: 100%;*/
    min-height: 100px;
    line-height: 1.5;
    margin: 20px 0px 20px 20px;
    padding-right: 20px;
    align-items: center;
    border-right: 1px solid #eeeeef;
}

#yk-list-tree-ol li {
    line-height: 1.8;
    margin-bottom: 10px;
    height: 25px;
}

#yk-list-tree-ol li a {
    color: #fff;
}

a#yk-list-tree-click.current,
#yk-list-tree-ol li.current a {
    color: #f2ff2c;
}

#yk-list-tree-ol::-webkit-scrollbar-track {
    background-color: #fff;
}

#yk-list-tree-ol::-webkit-scrollbar-thumb {
    background: rgb(199, 201, 204);
}

#yk-list-tree-ol::-webkit-scrollbar {
    width: 3px;
}