ul.table-of-contents { position: fixed; top: 30px; left: 10px; z-index: 100; /* ココから下はデザイン */ background: rgb(229,242,239,0.9); border-radius: 7px; box-shadow: rgb(0,0,0,0.1)0 0 9px; } button#toggle-button { border: none; border-…