Corner rounding controls how soft the size chart popup's corners look on your storefront. It's a store-wide setting — change it once and every size chart popup updates to match. Here's how to round the corners, or remove the rounding for sharp, square edges.
Add rounded corners
In your Shopify admin, open SmartSize → Settings. In the Sections list, under Size chart settings, select Corner rounding. Drag the slider to adjust the radius — the preview on the right updates live as you move it.
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The default is 12 px, which gives the popup gently rounded corners. You can set anything from 0 to 35 px — the higher the number, the softer the corners. If you know the exact value you want, type it straight into the Corner radius (px) field. When the preview looks right, click Save.
This is how the popup looks on your storefront with the 12 px default:
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Remove rounded corners
Prefer sharp, square edges? Set Corner radius (px) to 0 — type it into the field or drag the slider all the way to the left. The preview switches to square corners immediately.
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Click Save, and the size chart popup renders with clean, square corners — a great match for minimal themes:
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💡 Tip: Corner rounding is a store-wide default. If one size chart needs a different radius, open that chart in the size chart editor and adjust Corner rounding in its popup settings — that overrides the default for that chart only. The fit quiz popup has its own Corner rounding setting under Fit quiz settings.