Update css for TOC title to avoid the duplication.
.toc { background-color: var(--color-tag-bg); overflow-x:auto; padding: 0.01em 1em; border-radius: 10px; > ul::before { content: '≡文章目錄'; font-weight: 700; display: inline-block; margin-left: -1.5em; margin-bottom: 0.1em; letter-space: 0.01em; }