Trilium/apps/client/src/widgets/NoteDetail.css

.component.note-detail {
    max-width: var(--max-content-width); /* Inherited from .note-split */
    font-family: var(--detail-font-family);
    font-size: var(--detail-font-size);
    contain: none;
}

body.prefers-centered-content .note-detail {
    /* Horizontally center the widget in its parent when the "Keep content centered" option is on */
    margin-inline: auto;
}

.note-detail > * {
    contain: none;
}