In the badges section, you can customize the Badge position and Corner radius and also you can change the Background Colour theme, and Text color for the Sale, Sold, and a New badge.
Step 1 : From your Shopify admin, go to Online Store > Themes.
Step 2 : Find the theme that you want to Edit and click Customize.
Step 3 : Click Theme Settings.
Step 4 : Theme Settings > Badges.