.mce-toc li::before {
    counter-increment: headers;
    content: counters(headers, ".") ". ";
    color: #999;
}
.mce-toc ol {
    counter-reset: headers;
    list-style-type: none;
    overflow-x: auto;
    margin-bottom: 0;
}
.mce-toc {
    padding:10px 10px 10px 0;
    background: #EFEFEF;
    border-radius:10px;
    font-size:90%;
}
.mce-toc ol ol {
    margin: 0;
}
.mce-toc button {
    margin-bottom: 0;
}