Click on the Checkout Coupon block and place it accordingly.
Style the block container by tweaking the colors. Also, change the container’s border style to look more aesthetic.
Design the block by taking one by one part of it. First, change the background color and text color of the coupon header.
Navigate to the Coupon form and style it by changing colors of the background, text, and placeholder text.
Then, there is a coupon button. To make it elegant try changing its background color and fonts. Fonts create a great impression.
Similarly, change the text, background colors, and borders according to your preference.
When you hover the cursor, design the coupon button by utilizing the options shown in the picture.