インデントの深さが分かるように縦線を入れるUserCSS
code:style.css
.app:not(.presentation) .indent-mark .char-index:not(:nth-last-child(1)):not(:nth-last-child(2)) {
position: relative;
}
.app:not(.presentation) .indent-mark .char-index:not(:nth-last-child(1)):not(:nth-last-child(2))::before {
content: " ";
position: absolute;
left: 48%;
margin: -5px 0;
border-left: 1px solid var(--ui);
}