The size chart button's styling lives in your Shopify theme editor — inside the SmartSize Size chart app embed — so the button always matches the rest of your storefront. In SmartSize, open Settings → Button size charts → Styling for an overview of everything you can change, then click Customize in theme editor to jump straight to the right place.
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Change the button text
In the theme editor's Button settings, the Button text field controls the label shoppers see — SIZE GUIDE by default. This is your store-wide default label. If you sell in more than one language, you can translate it with Shopify's free Translate & Adapt app — see How to translate your size chart button.
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Text link or full button
The Style setting switches between two looks. Link shows the label as a simple text link that blends in with the rest of your product page.
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Button turns it into a full button that stands out next to your size selector. You can also add a small hanger, ruler, or table icon with the Icon dropdown.
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Pick your colors
Use Text color and Background color to match the button to your brand. The background is optional — leave it unset to keep the button transparent.
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Round the corners
The Corner radius slider rounds the button corners. Set it to 0 for sharp corners, or push it all the way up for a pill shape.
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Adjust the spacing
The Margin sliders add outer spacing around the button — top, right, bottom, and left — which is handy when it sits too close to neighboring elements and needs a little breathing room.
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💡 Tip: don't forget to click Save in the theme editor. These settings are your store-wide defaults — if you've placed the button with an app block, you can also override the styling on that page by setting Button styling to Customize on this page.