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Three CSS fixes for the codemirror-live-markdown live preview: 1. Remove header underlines (border-bottom: none on .cm-heading-line) 2. Heading markers (## etc) positioned absolutely in left gutter area so they never push heading text horizontally when revealed 3. List bullets always occupy fixed width (font-size: 1em, not collapsed), showing • when inactive and source char (-) when active Verified via Playwright: 0px horizontal shift on both headings and bullets. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>