diff --git a/public/styles/global.css b/public/styles/global.css
index 8977452..34f6140 100644
--- a/public/styles/global.css
+++ b/public/styles/global.css
@@ -429,6 +429,13 @@ h1 {
   font-weight: 700;
 }
 
+.filter-panel legend {
+  float: left;
+  width: 100%;
+  padding: 0;
+  margin-bottom: 0.75rem;
+}
+
 .search-label {
   display: block;
   margin-bottom: 0.55rem;
@@ -454,11 +461,12 @@ a:focus-visible {
 }
 
 .filter-list {
+  clear: both;
   display: grid;
   gap: 0.4rem;
   max-height: 18rem;
   overflow: auto;
-  margin-top: 0.75rem;
+  margin-top: 0;
 }
 
 .filter-list label {
diff --git a/tests/catalog.spec.ts b/tests/catalog.spec.ts
index e507ab2..1075bd2 100644
--- a/tests/catalog.spec.ts
+++ b/tests/catalog.spec.ts
@@ -136,6 +136,46 @@ test('desktop filter rail scrolls independently from the catalog page', async ({
   expect(metrics.listScrollbarColor).not.toBe('auto');
 });
 
+test('sidebar filter titles sit inside their panels', async ({ page }) => {
+  await page.setViewportSize({ width: 1280, height: 720 });
+  await page.goto('/');
+
+  const panelMetrics = await page.locator('.filter-panel').evaluateAll((panels) =>
+    panels
+      .map((panel) => {
+        const legend = panel.querySelector('legend');
+        if (!legend) return null;
+
+        const panelBox = panel.getBoundingClientRect();
+        const legendBox = legend.getBoundingClientRect();
+        const styles = window.getComputedStyle(panel);
+
+        return {
+          title: legend.textContent?.trim(),
+          panelTop: panelBox.top,
+          panelLeft: panelBox.left,
+          legendTop: legendBox.top,
+          legendLeft: legendBox.left,
+          paddingTop: Number.parseFloat(styles.paddingTop),
+          paddingLeft: Number.parseFloat(styles.paddingLeft),
+        };
+      })
+      .filter(Boolean),
+  );
+
+  expect(panelMetrics).toEqual(
+    expect.arrayContaining([
+      expect.objectContaining({ title: 'Platform' }),
+      expect.objectContaining({ title: 'Base' }),
+    ]),
+  );
+
+  for (const metrics of panelMetrics) {
+    expect(metrics!.legendTop).toBeGreaterThanOrEqual(metrics!.panelTop + metrics!.paddingTop - 1);
+    expect(metrics!.legendLeft).toBeGreaterThanOrEqual(metrics!.panelLeft + metrics!.paddingLeft - 1);
+  }
+});
+
 test('detail page renders metadata and private file links', async ({ page }) => {
   await page.goto('/hack/radical-red/');