chore: reset margin top in navsidebar under 700 pixels

[stevekaplan123]

Description

On the search page below 700px wide, the "no results" message was partially hidden behind a gray block — the call-to-action button and the "report a bug / contact us" caption were cut off or invisible. Turns out that this was a problem on many pages in the site so the fix here is global.

The cause is a background hack on .navSidebar in s2.css:1510-1517:

border-top: 80px solid #FBFBFA;
margin: -80px 0 0 0;

Code Changes

margin-top: 0 — stops the sidebar being pulled up into the content. This alone removes the overlap.
border-top: none — removes the gray band itself, so no stray stripe is left behind.
width: 100% — the stacked sidebar was staying a fixed 420px, leaving dead space beside it.

[gitvelocity-reviewer]

📊 Code Quality Score: 1/100

8 × 0.1 = 0.8, floored to minimum of 1

Category	Score	Factors
🔭 Scope	2/20	One block of 10 lines added to static/css/s2.css. No other files touched. The change targets two existing class selectors, .sidebarLayout and .navSidebar, within a new media query.
🏗️ Architecture	0/20	No module boundary changed. The addition sits inside an existing CSS file with no new dependencies or structural reorganization.
⚙️ Implementation	2/20	Four CSS property declarations inside a single @media (max-width: 700px) block: flex-direction: column on .sidebarLayout, and width: 100%, margin-top: 0, border-top: none on .navSidebar. No algorithmic logic.
⚠️ Risk	2/20	.navSidebar is not scoped to .searchContent in the media query, so the rule applies to every instance of .navSidebar site-wide on narrow viewports, not only within search pages. The change is visual-only and easily reverted.
✅ Quality	2/15	No test accompanies the change. CSS responsive changes are not typically unit-tested, but no visual regression test or screenshot comparison is referenced.
🔒 Perf / Security	0/5	No performance or security work present in this diff.

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